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.

A203537 Number of nX3 0..2 arrays with every element neighboring horizontally or vertically both a 0 and a 1.

Table of values

n a(n)
1 0
2 4
3 72
4 144
5 1840
6 10404
7 69920
8 490000
9 3317120
10 22524516
11 153723240
12 1044840976
13 7112904336
14 48420242116
15 329561076960
16 2243249071504
17 15269163209664
18 103931377966276
19 707427841294920
20 4815226903450896

List of values

[0, 4, 72, 144, 1840, 10404, 69920, 490000, 3317120, 22524516, 153723240, 1044840976, 7112904336, 48420242116, 329561076960, 2243249071504, 15269163209664, 103931377966276, 707427841294920, 4815226903450896]

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

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