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.

A188404 Number of (3*n) X n binary arrays with rows in nonincreasing order, 3 ones in every column and no more than 3 ones in any row.

Table of values

n a(n)
1 1
2 4
3 23
4 214
5 2698
6 44288
7 902962
8 22262244
9 648446612
10 21940389584
11 849992734124
12 37273085398456
13 1831837147680872
14 100066601315825216
15 6031974947471801512
16 398733149802770699792
17 28744536471179273843088
18 2248840133521868856571456
19 190105368229118222009348848

List of values

[1, 4, 23, 214, 2698, 44288, 902962, 22262244, 648446612, 21940389584, 849992734124, 37273085398456, 1831837147680872, 100066601315825216, 6031974947471801512, 398733149802770699792, 28744536471179273843088, 2248840133521868856571456, 190105368229118222009348848]

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

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