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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.

A184469 1/6 the number of (n+2) X 3 0..2 arrays with each 3 X 3 subblock containing one of one value, four of another, and four of the last.

Table of values

n a(n)
1 315
2 1095
3 3705
4 12339
5 45585
6 161739
7 559305
8 2147931
9 7836561
10 27667251
11 108488889
12 401513355
13 1432182465
14 5674143555
15 21145265865
16 75792359259
17 301775575185
18 1128283339059
19 4053433203225
20 16177609637451
21 60579025906401

List of values

[315, 1095, 3705, 12339, 45585, 161739, 559305, 2147931, 7836561, 27667251, 108488889, 401513355, 1432182465, 5674143555, 21145265865, 75792359259, 301775575185, 1128283339059, 4053433203225, 16177609637451, 60579025906401]

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

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