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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.

A303309 Number of nX3 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 3
2 3
3 12
4 11
5 19
6 34
7 53
8 83
9 136
10 223
11 359
12 578
13 937
14 1519
15 2456
16 3971
17 6427
18 10402
19 16829
20 27227
21 44056
22 71287
23 115343
24 186626
25 301969
26 488599
27 790568
28 1279163
29 2069731
30 3348898
31 5418629
32 8767523
33 14186152
34 22953679
35 37139831
36 60093506

List of values

[3, 3, 12, 11, 19, 34, 53, 83, 136, 223, 359, 578, 937, 1519, 2456, 3971, 6427, 10402, 16829, 27227, 44056, 71287, 115343, 186626, 301969, 488599, 790568, 1279163, 2069731, 3348898, 5418629, 8767523, 14186152, 22953679, 37139831, 60093506]

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

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