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.

A333735 Number of non-isomorphic 5 X 5 nonnegative integer matrices with all row and column sums equal to n up to permutations of rows and columns.

Table of values

n a(n)
0 1
1 1
2 7
3 31
4 264
5 1856
6 12703
7 71457
8 348622
9 1477513
10 5584477
11 19071063
12 59748789
13 173510124
14 471615249
15 1208756261
16 2940705168
17 6827326093
18 15197942364
19 32566376769
20 67408927586
21 135184087822
22 263356043520
23 499542801451
24 924501767285
25 1672391804486

List of values

[1, 1, 7, 31, 264, 1856, 12703, 71457, 348622, 1477513, 5584477, 19071063, 59748789, 173510124, 471615249, 1208756261, 2940705168, 6827326093, 15197942364, 32566376769, 67408927586, 135184087822, 263356043520, 499542801451, 924501767285, 1672391804486]

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

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