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.

A232156 Number of nX3 0..3 arrays with every 0 next to a 1, every 1 next to a 2 and every 2 next to a 3 horizontally, vertically or antidiagonally, and no adjacent values equal.

Table of values

n a(n)
1 4
2 62
3 290
4 1284
5 5902
6 27086
7 124436
8 572080
9 2629946
10 12090710
11 55591878
12 255589946
13 1175154022
14 5403111082
15 24842308392
16 114220099740
17 525160514282
18 2414582116408
19 11101765510580
20 51043677955498
21 234688597761528

List of values

[4, 62, 290, 1284, 5902, 27086, 124436, 572080, 2629946, 12090710, 55591878, 255589946, 1175154022, 5403111082, 24842308392, 114220099740, 525160514282, 2414582116408, 11101765510580, 51043677955498, 234688597761528]

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

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