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.

A207923 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 0 and 1 1 1 vertically.

Table of values

n a(n)
1 2
2 16
3 72
4 576
5 7744
6 138384
7 3773248
8 143233024
9 7961867964
10 694232238436
11 87251969161984
12 15584659071915024
13 4290136697951345984
14 1785288592992685527184
15 1059504761310616996153800

List of values

[2, 16, 72, 576, 7744, 138384, 3773248, 143233024, 7961867964, 694232238436, 87251969161984, 15584659071915024, 4290136697951345984, 1785288592992685527184, 1059504761310616996153800]

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

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