A221406 - cp's OEIS frontend

A221406 Number of nX5 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two.

n	a(n)
1	0
2	120
3	0
4	47156
5	0
6	18852560
7	0
8	7505597654
9	0
10	2984164922226
11	0
12	1185951960926210
13	0
14	471249297474390114
15	0
16	187247029623260170674
17	0
18	74400007192624944055794
19	0
20	29561675588644660921885852
21	0

[0, 120, 0, 47156, 0, 18852560, 0, 7505597654, 0, 2984164922226, 0, 1185951960926210, 0, 471249297474390114, 0, 187247029623260170674, 0, 74400007192624944055794, 0, 29561675588644660921885852, 0]

cp's OEIS Frontend

A221406 Number of nX5 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two.

Table of values

List of values