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.

A187669 Number of (n+1)X(n+1) 0..2 arrays with each 2X2 subblock nonsingular and the array of 2X2 subblock determinants symmetric about the diagonal and antidiagonal.

Table of values

n a(n)
1 50
2 550
3 11282
4 612204
5 65533922
6 18950885038

List of values

[50, 550, 11282, 612204, 65533922, 18950885038]

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

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