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.

A303244 Number of 4Xn 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 8
2 3
3 55
4 10
5 255
6 149
7 1676
8 3307
9 18505
10 65498
11 290437
12 1198777
13 5087180
14 21490967
15 90839013
16 384340750
17 1625471539
18 6876513885
19 29091034026
20 123070552817
21 520674602677
22 2202800218342
23 9319394664521
24 39427619066391
25 166806435914930

List of values

[8, 3, 55, 10, 255, 149, 1676, 3307, 18505, 65498, 290437, 1198777, 5087180, 21490967, 90839013, 384340750, 1625471539, 6876513885, 29091034026, 123070552817, 520674602677, 2202800218342, 9319394664521, 39427619066391, 166806435914930]

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

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