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.

A222772 Number of 4Xn 0..1 arrays with exactly floor(4Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order.

Table of values

n a(n)
1 0
2 20
3 96
4 465
5 2608
6 15077
7 89811
8 544302
9 3349328
10 20823047
11 130535918
12 823585242
13 5221057054
14 33231082276
15 212180118775
16 1358528423728
17 8718262087314
18 56062919553225
19 361148981248207
20 2330144611056838

List of values

[0, 20, 96, 465, 2608, 15077, 89811, 544302, 3349328, 20823047, 130535918, 823585242, 5221057054, 33231082276, 212180118775, 1358528423728, 8718262087314, 56062919553225, 361148981248207, 2330144611056838]

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

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