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Search: id:A145153
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| A145153 |
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Square array A(n,k), n>=0, k>=0, read by antidiagonals, where sequence a_k of column k is the expansion of x/((1 - x - x^4)*(1 - x)^(k - 1)). |
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28
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| 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 2, 1, 0, 0, 1, 3, 3, 1, 1, 0, 1, 4, 6, 4, 2, 1, 0, 1, 5, 10, 10, 6, 3, 1, 0, 1, 6, 15, 20, 16, 9, 4, 1, 0, 1, 7, 21, 35, 36, 25, 13, 5, 2, 0, 1, 8, 28, 56, 71, 61, 38, 18, 7, 3, 0, 1, 9, 36, 84, 127, 132, 99, 56, 25, 10, 4, 0, 1, 10, 45, 120, 211, 259, 231, 155
(list; table; graph; listen)
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OFFSET
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0,13
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COMMENT
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Each row sequence a_n (for n>0) is produced by a polynomial of degree n-1, whose (rational) coefficients are given in row n of A145140/A145141. The coefficients *(n-1)! are given in A145142.
Each column sequence a_k is produced by a recursion, whose coefficients are given by row k of A145152.
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FORMULA
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G.f. of column k: x/((1-x-x^4)*(1-x)^(k-1)).
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EXAMPLE
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Square array A(n,k) begins:
0 0 0 0 0 0 0 ...
1 1 1 1 1 1 1 ...
0 1 2 3 4 5 6 ...
0 1 3 6 10 15 21 ...
0 1 4 10 20 35 56 ...
1 2 6 16 36 71 127 ...
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MAPLE
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A:= proc(n, k) coeftayl (x/ (1-x-x^4)/ (1-x)^(k-1), x=0, n) end: seq (seq (A(n, d-n), n=0..d), d=0..13);
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CROSSREFS
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Rows 0-9 give: A000004, A000012, A001477, A000217, A000292, A145126, A145127, A145128, A145129, A145130.
Columns 0-9 give: A017898(n-1) for n>0, A003269, A098578, A145131, A145132, A145133, A145134, A145135, A145136, A145137.
Diagonal gives: A145138.
Antidiaginal sums give: A145139.
Numerators/denumerators of polynomials for rows give: A145140/A145141.
Cf.: A145142, A145143, A145144, A145145, A145146, A145147, A145148, A145149, A145150, A145151, A145152.
Sequence in context: A144225 A017837 A127840 this_sequence A076837 A055363 A110855
Adjacent sequences: A145150 A145151 A145152 this_sequence A145154 A145155 A145156
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KEYWORD
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nonn,tabl
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AUTHOR
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Alois P. Heinz (heinz(AT)hs-heilbronn.de), Oct 03 2008
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