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.

A219144 Unchanging value maps: number of 3Xn binary arrays indicating the locations of corresponding elements unequal to no horizontal, diagonal or antidiagonal neighbor in a random 0..2 3Xn array.

Table of values

n a(n)
1 1
2 18
3 78
4 281
5 1072
6 4033
7 15255
8 57963
9 220068
10 835820
11 3172817
12 12044346
13 45722019
14 173574485
15 658947323
16 2501581220
17 9496787730
18 36052730049
19 136867284190
20 519590670019
21 1972527813429
22 7488329193659
23 28428025632710

List of values

[1, 18, 78, 281, 1072, 4033, 15255, 57963, 220068, 835820, 3172817, 12044346, 45722019, 173574485, 658947323, 2501581220, 9496787730, 36052730049, 136867284190, 519590670019, 1972527813429, 7488329193659, 28428025632710]

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

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