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.

A187631 Number of (n+1)X(n+1) 0..3 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 64
2 2924
3 14044
4 31903442
5 33869160

List of values

[64, 2924, 14044, 31903442, 33869160]

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

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