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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.

A221896 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns.

Table of values

n a(n)
1 13
2 2241
3 236532
4 25821731
5 2814706089
6 307131177266
7 33498766685333
8 3653989849310339
9 398568427571535443
10 43474867097541833158
11 4742132126980966864298
12 517260183698295861792396

List of values

[13, 2241, 236532, 25821731, 2814706089, 307131177266, 33498766685333, 3653989849310339, 398568427571535443, 43474867097541833158, 4742132126980966864298, 517260183698295861792396]

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

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