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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.

A227160 Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.

Table of values

n a(n)
1 2
2 8
3 62
4 944
5 37012
6 3754497
7 1009485843
8 732609096798

List of values

[2, 8, 62, 944, 37012, 3754497, 1009485843, 732609096798]

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

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