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.

A331723 Number of nonequivalent 3-column nonnegative integer matrices with column sums n and any number of nonzero rows up to permutation of rows and columns.

Table of values

n a(n)
0 1
1 3
2 23
3 162
4 1338
5 10585
6 82694
7 612700
8 4337251
9 29267424
10 189156449
11 1174258396
12 7027652401
13 40665520091
14 228144483468
15 1243885610116
16 6604645458105
17 34214740832064
18 173212883196153
19 858180731755508
20 4166502761618085
21 19845587224548144
22 92834956645809855
23 426901317803272329

List of values

[1, 3, 23, 162, 1338, 10585, 82694, 612700, 4337251, 29267424, 189156449, 1174258396, 7027652401, 40665520091, 228144483468, 1243885610116, 6604645458105, 34214740832064, 173212883196153, 858180731755508, 4166502761618085, 19845587224548144, 92834956645809855, 426901317803272329]

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

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