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.

A302725 Number of n X 5 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 3
2 27
3 74
4 287
5 1307
6 4491
7 17828
8 80293
9 304958
10 1254491
11 5534905
12 22489246
13 94732609
14 413955598
15 1740468900
16 7436093945
17 32346857005
18 138259463124
19 595133929409
20 2583681234015
21 11128738383880
22 48080514602454

List of values

[3, 27, 74, 287, 1307, 4491, 17828, 80293, 304958, 1254491, 5534905, 22489246, 94732609, 413955598, 1740468900, 7436093945, 32346857005, 138259463124, 595133929409, 2583681234015, 11128738383880, 48080514602454]

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

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