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.

A213692 Half the number of (n+1) X (n+1) symmetric 0..3 arrays with no 2 X 2 subblock summing to 6.

Table of values

n a(n)
1 28
2 1320
3 208072
4 109820000
5 193946752094
6 1146407046198040
7 22678299640600736258
8 1501445596428593204920908
9 332684482425964910985336666019
10 246706401290583205383638262307956104

List of values

[28, 1320, 208072, 109820000, 193946752094, 1146407046198040, 22678299640600736258, 1501445596428593204920908, 332684482425964910985336666019, 246706401290583205383638262307956104]

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

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