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Search: id:A166278
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| A166278 |
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Square array A(n,k), n,k>=0, read by antidiagonals: A(n,k) is the total element sum of the k-fold f transform applied to the length n sequence of 1's. And f returns a sorted result after multiplying the elements in its input sequence with 1, 2, 3,... in descending size order. |
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1
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| 0, 0, 1, 0, 1, 2, 0, 1, 3, 3, 0, 1, 4, 6, 4, 0, 1, 6, 10, 10, 5, 0, 1, 8, 19, 20, 15, 6, 0, 1, 12, 33, 46, 35, 21, 7, 0, 1, 16, 63, 100, 94, 56, 28, 8, 0, 1, 24, 111, 220, 242, 172, 84, 36, 9, 0, 1, 32, 201, 488, 633, 514, 290, 120, 45, 10, 0, 1, 48, 369, 1104, 1643, 1518, 984, 460, 165
(list; table; graph; listen)
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OFFSET
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0,6
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EXAMPLE
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Square array begins:
0 0 0 0 0 0 ...
1 1 1 1 1 1 ...
2 3 4 6 8 12 ...
3 6 10 19 33 63 ...
4 10 20 46 100 220 ...
5 15 35 94 242 633 ...
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MAPLE
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f:= l-> sort ([seq (sort (l, `>`)[i]*i, i=1..nops(l))]): A:= (n, k)-> add (i, i=(f@@k) ([1$j=1..n])): seq (seq (A (n, d-n), n=0..d), d=0..15);
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CROSSREFS
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Rows n=0-2 give: A000004, A000012, A029744(k+2). Columns k=0-3 give: A001477, A000217, A000292, A070893.
Sequence in context: A089112 A155584 A139600 this_sequence A103438 A167279 A068920
Adjacent sequences: A166275 A166276 A166277 this_sequence A166279 A166280 A166281
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Alois P. Heinz (heinz(AT)hs-heilbronn.de), Oct 10 2009
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