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.

A207891 Number of n X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 0 and 1 1 1 vertically.

Table of values

n a(n)
1 2
2 16
3 84
4 870
5 11196
6 205258
7 5888458
8 243318702
9 13997746826
10 1221755612002
11 156218303323950
12 28414320426633740
13 7652673923813342076
14 3016400502880224884497
15 1720903600232362236817474

List of values

[2, 16, 84, 870, 11196, 205258, 5888458, 243318702, 13997746826, 1221755612002, 156218303323950, 28414320426633740, 7652673923813342076, 3016400502880224884497, 1720903600232362236817474]

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

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