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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.

A227020 Number of n X n (0,1,2) arrays of permanents of 2X2 subblocks of some (n+1)X(n+1) binary array with rows and columns of the latter in lexicographically nondecreasing order.

Table of values

n a(n)
1 3
2 26
3 335
4 10050
5 786154
6 168973605
7 104606988712

List of values

[3, 26, 335, 10050, 786154, 168973605, 104606988712]

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

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