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.

A268793 Number of nX3 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once.

Table of values

n a(n)
1 12
2 78
3 248
4 950
5 3384
6 11948
7 41248
8 140698
9 474472
10 1586038
11 5262024
12 17348096
13 56884272
14 185647624
15 603388088
16 1953997896
17 6307338900
18 20300666174
19 65169102416
20 208712267048
21 666993883320
22 2127375490930
23 6773070493400

List of values

[12, 78, 248, 950, 3384, 11948, 41248, 140698, 474472, 1586038, 5262024, 17348096, 56884272, 185647624, 603388088, 1953997896, 6307338900, 20300666174, 65169102416, 208712267048, 666993883320, 2127375490930, 6773070493400]

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

Content is available under The OEIS End-User License Agreement.