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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.

A225827 Number of binary pattern classes in the (3,n)-rectangular grid: two patterns are in same class if one of them can be obtained by a reflection or 180-degree rotation of the other.

Table of values

n a(n)
0 1
1 6
2 24
3 168
4 1120
5 8640
6 66816
7 529920
8 4212736
9 33632256
10 268713984
11 2148630528
12 17184194560
13 137456517120
14 1099579785216
15 8796367749120
16 70369826308096
17 562954298720256
18 4503616874348544
19 36028866141093888
20 288230651566489600
21 2305844111946547200

List of values

[1, 6, 24, 168, 1120, 8640, 66816, 529920, 4212736, 33632256, 268713984, 2148630528, 17184194560, 137456517120, 1099579785216, 8796367749120, 70369826308096, 562954298720256, 4503616874348544, 36028866141093888, 288230651566489600, 2305844111946547200]

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

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