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.

A207311 Number of n X n 0..2 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal.

Table of values

n a(n)
1 3
2 81
3 15390
4 21162579
5 205235353935
6 14121763303437256
7 6886304943923084187412
8 23820527297958550757568717516
9 584573521981314585923770355820671056

List of values

[3, 81, 15390, 21162579, 205235353935, 14121763303437256, 6886304943923084187412, 23820527297958550757568717516, 584573521981314585923770355820671056]

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

Content is available under The OEIS End-User License Agreement.