cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A294579 Square array A(n,k), n >= 1, k >= 0, read by antidiagonals, where A(n,k) is Sum_{d|n} d^(1 + k*n/d).

Original entry on oeis.org

1, 1, 3, 1, 5, 4, 1, 9, 10, 7, 1, 17, 28, 25, 6, 1, 33, 82, 97, 26, 12, 1, 65, 244, 385, 126, 80, 8, 1, 129, 730, 1537, 626, 588, 50, 15, 1, 257, 2188, 6145, 3126, 4508, 344, 161, 13, 1, 513, 6562, 24577, 15626, 35652, 2402, 2049, 163, 18
Offset: 1

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Author

Seiichi Manyama, Nov 02 2017

Keywords

Examples

			Square array begins:
  1,  1,   1,   1,    1, ...
  3,  5,   9,  17,   33, ...
  4, 10,  28,  82,  244, ...
  7, 25,  97, 385, 1537, ...
  6, 26, 126, 626, 3126, ...
		

Crossrefs

Columns k=0..2 give A000203, A078308, A294567.
Rows k=0..1 give A000012, A000051(n+1).

Formula

L.g.f. of column k: -log(Product_{j>=1} (1 - j^k * x^j)). - Seiichi Manyama, Jun 02 2019
G.f. of column k: Sum_{j>0} j^(k+1) * x^j / (1 - j^k * x^j). - Seiichi Manyama, Jan 14 2023
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