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.

A222510 Number of 2Xn 0..1 arrays with exactly floor(2Xn/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 0
3 4
4 3
5 10
6 32
7 44
8 176
9 326
10 888
11 2076
12 5275
13 12306
14 32324
15 74284
16 195959
17 460498
18 1189652
19 2861016
20 7307596
21 17774488
22 45231012
23 110756056
24 281073368
25 692630902
26 1752734824
27 4342317676
28 10967047059
29 27278066490
30 68820679380
31 171685581996

List of values

[0, 0, 4, 3, 10, 32, 44, 176, 326, 888, 2076, 5275, 12306, 32324, 74284, 195959, 460498, 1189652, 2861016, 7307596, 17774488, 45231012, 110756056, 281073368, 692630902, 1752734824, 4342317676, 10967047059, 27278066490, 68820679380, 171685581996]

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

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