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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.

A187630 Number of (n+1)X(n+1) 0..2 arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular.

Table of values

n a(n)
1 31
2 446
3 1648
4 557382
5 672698
6 21411605018
7 22329564088

List of values

[31, 446, 1648, 557382, 672698, 21411605018, 22329564088]

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

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