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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.

A303243 Number of 3 X n 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 4
2 2
3 18
4 8
5 60
6 56
7 236
8 428
9 1248
10 3264
11 8624
12 24720
13 65816
14 187464
15 509576
16 1428608
17 3932112
18 10932480
19 30245800
20 83854984
21 232353544
22 643805072
23 1784418352
24 4944349600
25 13703715720
26 37974373160
27 105243781928
28 291657188656

List of values

[4, 2, 18, 8, 60, 56, 236, 428, 1248, 3264, 8624, 24720, 65816, 187464, 509576, 1428608, 3932112, 10932480, 30245800, 83854984, 232353544, 643805072, 1784418352, 4944349600, 13703715720, 37974373160, 105243781928, 291657188656]

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

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