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.

A187527 Number of (n+1)X(n+1) 0..3 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation.

Table of values

n a(n)
1 192
2 74
3 35026
4 20554
5 164460556

List of values

[192, 74, 35026, 20554, 164460556]

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

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