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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.

A263367 Number of (n+1)X(2+1) 0..2 arrays with each row and column divisible by 7, read as a base-3 number with top and left being the most significant digits.

Table of values

n a(n)
1 1
2 2
3 7
4 29
5 112
6 367
7 1359
8 5370
9 21447
10 86013
11 343936
12 1371301
13 5479081
14 21913562
15 87653287
16 350634149
17 1402534912
18 5609859607
19 22439049159
20 89756056050
21 359024196327
22 1436098422693
23 5744393762896
24 22977556193101
25 91910198451361

List of values

[1, 2, 7, 29, 112, 367, 1359, 5370, 21447, 86013, 343936, 1371301, 5479081, 21913562, 87653287, 350634149, 1402534912, 5609859607, 22439049159, 89756056050, 359024196327, 1436098422693, 5744393762896, 22977556193101, 91910198451361]

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

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