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Search: id:A143593
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| A143593 |
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Triangle read by rows, square of an infinite lower triangular matrix with 1's in the first column and the rest 2's. |
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+0
2
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| 1, 3, 4, 5, 8, 4, 7, 12, 8, 4, 9, 16, 12, 8, 4, 11, 20, 16, 12, 8, 4, 13, 24, 20, 16, 12, 8, 4, 15, 28, 24, 20, 16, 12, 8, 4, 17, 32, 28, 24, 20, 16, 12, 8, 4, 19, 36, 32, 28, 24, 20, 16, 12, 8, 4
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Row sums = A056220 starting with offset 1: (1, 7, 17, 31, 49, 71, 97,...).
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FORMULA
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Triangle read by rows, square of an infinite lower triangular matrix with 1's in the first column and the rest 2's. Square of (A000012 * (S(k) * 0^(n-k)), 1<=k<=n
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EXAMPLE
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The square of the infinite lower triangular matrix (1; 1,2; 1,2,2;...) =
1;
3, 4;
5, 8, 4;
7, 12, 8, 4;
9, 16, 12, 8, 4;
11, 20, 16, 12, 8, 4;
13, 24, 20, 16, 12, 8, 4;
...
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CROSSREFS
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Cf. A056220.
Sequence in context: A060728 A101761 A035359 this_sequence A028267 A092997 A021747
Adjacent sequences: A143590 A143591 A143592 this_sequence A143594 A143595 A143596
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson & Roger L. Bagula (qntmpkt(AT)yahoo.com), Aug 26 2008
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