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.

A221927 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns.

Table of values

n a(n)
1 13
2 2197
3 201378
4 20246283
5 2007184132
6 199492714651
7 19816266524892
8 1968651817039048
9 195572208446932549
10 19428830291892380296
11 1930127245301117267451
12 191745542191155118363255

List of values

[13, 2197, 201378, 20246283, 2007184132, 199492714651, 19816266524892, 1968651817039048, 195572208446932549, 19428830291892380296, 1930127245301117267451, 191745542191155118363255]

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

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