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.

A301538 Number of n X 5 0..1 arrays with every element equal to 0, 1 or 3 horizontally or vertically adjacent elements, with upper left element zero.

Table of values

n a(n)
1 8
2 21
3 61
4 212
5 658
6 2417
7 9037
8 33526
9 125626
10 477972
11 1824213
12 6971325
13 26702279
14 102479158
15 393541270
16 1511848952
17 5810405859
18 22336911663
19 85879249631
20 330208289450
21 1269748921864
22 4882763327280
23 18776842367003
24 72208138689837

List of values

[8, 21, 61, 212, 658, 2417, 9037, 33526, 125626, 477972, 1824213, 6971325, 26702279, 102479158, 393541270, 1511848952, 5810405859, 22336911663, 85879249631, 330208289450, 1269748921864, 4882763327280, 18776842367003, 72208138689837]

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

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