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.

A321515 Number of nonnegative integer matrices with sum of entries equal to n, no zero rows or columns, and distinct rows and columns.

Table of values

n a(n)
0 1
1 1
2 3
3 19
4 137
5 1209
6 12899
7 160395
8 2276229
9 36323217
10 643848837
11 12551081501
12 266868756473
13 6146455542737
14 152439235077709
15 4050427673024753
16 114791270281213209
17 3456412742412516649
18 110191808168628510207
19 3708004806262196242699
20 131339701217968663631857

List of values

[1, 1, 3, 19, 137, 1209, 12899, 160395, 2276229, 36323217, 643848837, 12551081501, 266868756473, 6146455542737, 152439235077709, 4050427673024753, 114791270281213209, 3456412742412516649, 110191808168628510207, 3708004806262196242699, 131339701217968663631857]

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

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