A221727 - cp's OEIS frontend

A221727 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with every occupancy equal to zero or two.

n	a(n)
1	4
2	52
3	540
4	6188
5	71310
6	824144
7	9525048
8	110070012
9	1271809066
10	14694217628
11	169767833676
12	1961352594276
13	22659537510670
14	261784302805272
15	3024367348612856
16	34940131867655732
17	403658398327592910

[4, 52, 540, 6188, 71310, 824144, 9525048, 110070012, 1271809066, 14694217628, 169767833676, 1961352594276, 22659537510670, 261784302805272, 3024367348612856, 34940131867655732, 403658398327592910]

cp's OEIS Frontend

A221727 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with every occupancy equal to zero or two.

Table of values

List of values