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.

A187531 Number of 5X5 0..n 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 0
2 1476
3 20554
4 273102
5 992410
6 5880944

List of values

[0, 1476, 20554, 273102, 992410, 5880944]

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

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