A221201 - cp's OEIS frontend

A221201 Number of 2 X n arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2.

n	a(n)
1	0
2	9
3	10
4	196
5	720
6	6400
7	34272
8	242064
9	1460368
10	9610000
11	60194160
12	387459856
13	2455717680
14	15698085264
15	99863349040
16	636989149456
17	4056917039280
18	25859869267600
19	164758872493872
20	1049992515273744
21	6690497356781488

[0, 9, 10, 196, 720, 6400, 34272, 242064, 1460368, 9610000, 60194160, 387459856, 2455717680, 15698085264, 99863349040, 636989149456, 4056917039280, 25859869267600, 164758872493872, 1049992515273744, 6690497356781488]

cp's OEIS Frontend

A221201 Number of 2 X n arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2.

Table of values

List of values