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.

A221901 Number of 4 X n 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 2305
3 235332
4 25821731
5 2815434576
6 307126807101
7 33499434763000
8 3654072363322660
9 398576690257243663
10 43475776796985596792
11 4742231413650315959473

List of values

[13, 2305, 235332, 25821731, 2815434576, 307126807101, 33499434763000, 3654072363322660, 398576690257243663, 43475776796985596792, 4742231413650315959473]

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

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