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.

A220596 Number of ways to reciprocally link elements of an n X n array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without 3-loops.

Table of values

n a(n)
1 1
2 2
3 65
4 9047
5 7558495
6 41011388731
7 1417058414112748
8 305516864725171735943
9 412489181606705015322075070

List of values

[1, 2, 65, 9047, 7558495, 41011388731, 1417058414112748, 305516864725171735943, 412489181606705015322075070]

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

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