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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.

A302676 Number of n X 4 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 5
2 5
3 12
4 20
5 33
6 64
7 121
8 231
9 440
10 838
11 1597
12 3042
13 5796
14 11042
15 21037
16 40079
17 76357
18 145473
19 277150
20 528017
21 1005960
22 1916521
23 3651291
24 6956316
25 13252938
26 25249049
27 48103634
28 91645416
29 174599746
30 332641529
31 633737387
32 1207375029
33 2300250057
34 4382358586

List of values

[5, 5, 12, 20, 33, 64, 121, 231, 440, 838, 1597, 3042, 5796, 11042, 21037, 40079, 76357, 145473, 277150, 528017, 1005960, 1916521, 3651291, 6956316, 13252938, 25249049, 48103634, 91645416, 174599746, 332641529, 633737387, 1207375029, 2300250057, 4382358586]

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

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