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.

A221329 Number of 2 X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

Table of values

n a(n)
1 1
2 17
3 119
4 866
5 6328
6 46211
7 337274
8 2460918
9 17953576
10 130970758
11 955393448
12 6969190236
13 50836821440
14 370827923908
15 2704988609708
16 19731401249156
17 143929610463264
18 1049886222652688
19 7658333144969252
20 55863255070913284

List of values

[1, 17, 119, 866, 6328, 46211, 337274, 2460918, 17953576, 130970758, 955393448, 6969190236, 50836821440, 370827923908, 2704988609708, 19731401249156, 143929610463264, 1049886222652688, 7658333144969252, 55863255070913284]

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

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