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.

A221690 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction.

Table of values

n a(n)
1 13
2 1336
3 95076
4 7033429
5 520770016
6 38558774282
7 2854945130275
8 211383822013331
9 15651127479431664
10 1158829375610866111
11 85801199678309146886
12 6352829859620504245102
13 470371595862197876296617

List of values

[13, 1336, 95076, 7033429, 520770016, 38558774282, 2854945130275, 211383822013331, 15651127479431664, 1158829375610866111, 85801199678309146886, 6352829859620504245102, 470371595862197876296617]

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

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