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.

A207124 Number of 4Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 0 1 1 vertically.

Table of values

n a(n)
1 9
2 81
3 289
4 1024
5 4096
6 14161
7 45796
8 150544
9 481636
10 1493284
11 4601025
12 14055001
13 42380100
14 126900225
15 378108025
16 1119906225
17 3301766521
18 9702250000
19 28419216400
20 83012558161
21 241951836996
22 703860593296
23 2044150748644

List of values

[9, 81, 289, 1024, 4096, 14161, 45796, 150544, 481636, 1493284, 4601025, 14055001, 42380100, 126900225, 378108025, 1119906225, 3301766521, 9702250000, 28419216400, 83012558161, 241951836996, 703860593296, 2044150748644]

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

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