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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.

A303318 Number of 6Xn 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 32
2 14
3 34
4 165
5 349
6 1221
7 7096
8 30280
9 102683
10 403872
11 1783894
12 7248640
13 27856927
14 111871711
15 461547267
16 1859721535
17 7397094062
18 29793428041
19 120739708314
20 486065859963
21 1951092593903
22 7859276232228
23 31701254570200
24 127635189909079

List of values

[32, 14, 34, 165, 349, 1221, 7096, 30280, 102683, 403872, 1783894, 7248640, 27856927, 111871711, 461547267, 1859721535, 7397094062, 29793428041, 120739708314, 486065859963, 1951092593903, 7859276232228, 31701254570200, 127635189909079]

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

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