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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.

A232336 Number of 2 X n 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally, with no adjacent elements equal.

Table of values

n a(n)
1 1
2 6
3 18
4 32
5 82
6 162
7 388
8 806
9 1858
10 3968
11 8962
12 19426
13 43396
14 94822
15 210578
16 462112
17 1022994
18 2250178
19 4972804
20 10951878
21 24180994
22 53291008
23 117604738
24 259275842
25 572028164
26 1261360966
27 2782483346
28 6136209184
29 13535050578
30 29850527586

List of values

[1, 6, 18, 32, 82, 162, 388, 806, 1858, 3968, 8962, 19426, 43396, 94822, 210578, 462112, 1022994, 2250178, 4972804, 10951878, 24180994, 53291008, 117604738, 259275842, 572028164, 1261360966, 2782483346, 6136209184, 13535050578, 29850527586]

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

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