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.

A302209 Number of nX5 0..1 arrays with every element equal to 0, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 1
2 34
3 32
4 111
5 448
6 1725
7 6423
8 24927
9 96909
10 373007
11 1440865
12 5580691
13 21589993
14 83526057
15 323320869
16 1251515211
17 4844117367
18 18751251811
19 72587463435
20 280991282231
21 1087753936319
22 4210898294795
23 16301265698437
24 63105914070197

List of values

[1, 34, 32, 111, 448, 1725, 6423, 24927, 96909, 373007, 1440865, 5580691, 21589993, 83526057, 323320869, 1251515211, 4844117367, 18751251811, 72587463435, 280991282231, 1087753936319, 4210898294795, 16301265698437, 63105914070197]

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

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