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.

A321586 Number of nonnegative integer matrices with sum of entries equal to n, no zero rows or columns, and distinct rows (or distinct columns).

Table of values

n a(n)
0 1
1 1
2 4
3 26
4 204
5 1992
6 23336
7 318080
8 4948552
9 86550424
10 1681106080
11 35904872576
12 836339613984
13 21100105791936
14 573194015723840
15 16681174764033728
16 517768654898701120
17 17074080118403865856
18 596117945858272441408
19 21967609729338776864384
20 852095613819396775627200

List of values

[1, 1, 4, 26, 204, 1992, 23336, 318080, 4948552, 86550424, 1681106080, 35904872576, 836339613984, 21100105791936, 573194015723840, 16681174764033728, 517768654898701120, 17074080118403865856, 596117945858272441408, 21967609729338776864384, 852095613819396775627200]

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

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