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.

A321652 Number of nonnegative integer matrices with sum of entries equal to n and no zero rows or columns, with weakly decreasing row sums and column sums.

Table of values

n a(n)
0 1
1 1
2 5
3 19
4 107
5 573
6 4050
7 29093
8 249301
9 2271020
10 23378901
11 257871081
12 3132494380
13 40693204728
14 572089068459
15 8566311524788
16 137165829681775
17 2327192535461323
18 41865158805428687
19 793982154675640340
20 15863206077534914434
21 332606431999260837036
22 7309310804287502958322
23 167896287022455809865568

List of values

[1, 1, 5, 19, 107, 573, 4050, 29093, 249301, 2271020, 23378901, 257871081, 3132494380, 40693204728, 572089068459, 8566311524788, 137165829681775, 2327192535461323, 41865158805428687, 793982154675640340, 15863206077534914434, 332606431999260837036, 7309310804287502958322, 167896287022455809865568]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.