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.

A210926 Number of n X n 0..3 symmetric matrices with every element equal to one, two or three horizontal and vertical neighbors, and new values 0..3 introduced in lower triangle row major order.

Table of values

n a(n)
1 0
2 1
3 4
4 95
5 9220
6 3055073
7 3000338892
8 8812917082915
9 76878364475257062
10 1995945343880703817038
11 154116672749530867319434810

List of values

[0, 1, 4, 95, 9220, 3055073, 3000338892, 8812917082915, 76878364475257062, 1995945343880703817038, 154116672749530867319434810]

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

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