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.

A188501 Number of n X 2 binary arrays without the pattern 0 1 0 diagonally, vertically or horizontally.

Table of values

n a(n)
1 4
2 16
3 49
4 144
5 441
6 1369
7 4225
8 12996
9 40000
10 123201
11 379456
12 1168561
13 3598609
14 11082241
15 34128964
16 105103504
17 323676081
18 996791184
19 3069714025
20 9453478441
21 29112890625
22 89655929476
23 276104007936
24 850288696321
25 2618545348864

List of values

[4, 16, 49, 144, 441, 1369, 4225, 12996, 40000, 123201, 379456, 1168561, 3598609, 11082241, 34128964, 105103504, 323676081, 996791184, 3069714025, 9453478441, 29112890625, 89655929476, 276104007936, 850288696321, 2618545348864]

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

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