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A293377
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Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of g.f. Product_{i>0} (1 + Sum_{j=1..k} j*x^(j*i))^2.
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4
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1, 1, 0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 7, 6, 0, 1, 2, 7, 10, 9, 0, 1, 2, 7, 16, 25, 14, 0, 1, 2, 7, 16, 31, 38, 22, 0, 1, 2, 7, 16, 39, 62, 78, 32, 0, 1, 2, 7, 16, 39, 70, 117, 116, 46, 0, 1, 2, 7, 16, 39, 80, 149, 206, 206, 66, 0, 1, 2, 7, 16, 39, 80, 159, 262, 362
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OFFSET
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0,5
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LINKS
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EXAMPLE
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Square array begins:
1, 1, 1, 1, 1, ...
0, 2, 2, 2, 2, ...
0, 3, 7, 7, 7, ...
0, 6, 10, 16, 16, ...
0, 9, 25, 31, 39, ...
0, 14, 38, 62, 70, ...
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CROSSREFS
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Product_{i>0} (1 + Sum_{j=1..k} j*x^(j*i))^m: A290217 (m=-1), A290216 (m=1), this sequence (m=2).
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KEYWORD
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AUTHOR
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STATUS
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approved
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