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.

A207420 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically.

Table of values

n a(n)
1 2
2 16
3 114
4 1521
5 55361
6 3892729
7 474552171
8 116947584576
9 59951676534906
10 60921409199181129
11 121441530119384020545
12 483128923550195512221129
13 3857404253001354057074186601
14 61418617253685924322130029824769

List of values

[2, 16, 114, 1521, 55361, 3892729, 474552171, 116947584576, 59951676534906, 60921409199181129, 121441530119384020545, 483128923550195512221129, 3857404253001354057074186601, 61418617253685924322130029824769]

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

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