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.

A207372 Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 1 vertically.

Table of values

n a(n)
1 20
2 400
3 1260
4 7130
5 31110
6 95220
7 353808
8 1047717
9 3056647
10 8773795
11 23208895
12 61308120
13 155644140
14 385081690
15 938448639
16 2231352160
17 5231232640
18 12073401891
19 27463516024
20 61756669106
21 137220631975
22 301814503696

List of values

[20, 400, 1260, 7130, 31110, 95220, 353808, 1047717, 3056647, 8773795, 23208895, 61308120, 155644140, 385081690, 938448639, 2231352160, 5231232640, 12073401891, 27463516024, 61756669106, 137220631975, 301814503696]

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

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