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.

A333902 Number of nonequivalent 3 X n nonnegative integer matrices with all column sums 3 and row sums n up to permutation of rows.

Table of values

n a(n)
0 1
1 1
2 2
3 10
4 70
5 566
6 4781
7 41357
8 364470
9 3257830
10 29450557
11 268701797
12 2470513849
13 22862694505
14 212758007450
15 1989477010250
16 18682005254390
17 176085344355510
18 1665167298000005
19 15793406377949405
20 150192477267201945
21 1431741484334863145
22 13678227386467491410

List of values

[1, 1, 2, 10, 70, 566, 4781, 41357, 364470, 3257830, 29450557, 268701797, 2470513849, 22862694505, 212758007450, 1989477010250, 18682005254390, 176085344355510, 1665167298000005, 15793406377949405, 150192477267201945, 1431741484334863145, 13678227386467491410]

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

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