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.

A222512 Number of 4Xn 0..1 arrays with exactly floor(4Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order.

Table of values

n a(n)
1 0
2 11
3 35
4 84
5 423
6 1753
7 8489
8 39873
9 200999
10 988455
11 5011027
12 24887392
13 126164927
14 633230135
15 3213998827
16 16234077336
17 82517378821
18 418670560481
19 2132042077379
20 10852726670501
21 55367063804357
22 282538940546931
23 1443897042955709

List of values

[0, 11, 35, 84, 423, 1753, 8489, 39873, 200999, 988455, 5011027, 24887392, 126164927, 633230135, 3213998827, 16234077336, 82517378821, 418670560481, 2132042077379, 10852726670501, 55367063804357, 282538940546931, 1443897042955709]

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

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