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.

A269055 Number of 4Xn 0..2 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 81
2 666
3 3258
4 24192
5 149358
6 971844
7 6053094
8 37741920
9 231943614
10 1417576284
11 8599619586
12 51899214960
13 311654917170
14 1863739501308
15 11103704855298
16 65935768579488
17 390381077316294
18 2305171593612444
19 13579182450069246

List of values

[81, 666, 3258, 24192, 149358, 971844, 6053094, 37741920, 231943614, 1417576284, 8599619586, 51899214960, 311654917170, 1863739501308, 11103704855298, 65935768579488, 390381077316294, 2305171593612444, 13579182450069246]

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

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