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.

A269070 Number of n X 3 binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.

Table of values

n a(n)
1 7
2 27
3 123
4 537
5 2343
6 10167
7 43959
8 189465
9 814359
10 3491691
11 14937987
12 63778065
13 271799175
14 1156345287
15 4911870063
16 20834207313
17 88251723687
18 373358554971
19 1577691954507
20 6659543294313
21 28081651307943
22 118299768626103

List of values

[7, 27, 123, 537, 2343, 10167, 43959, 189465, 814359, 3491691, 14937987, 63778065, 271799175, 1156345287, 4911870063, 20834207313, 88251723687, 373358554971, 1577691954507, 6659543294313, 28081651307943, 118299768626103]

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

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