A222015 - cp's OEIS frontend

A222015 Number of n X 2 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without move-in move-out straight through or left turns.

n	a(n)
1	3
2	27
3	188
4	1363
5	9838
6	70994
7	512456
8	3698699
9	26696370
10	192687348
11	1390767557
12	10038200482
13	72453134112
14	522947981192
15	3774503253017
16	27243388115499
17	196635728242591
18	1419265821803368
19	10243893573843252
20	73937773981558032

[3, 27, 188, 1363, 9838, 70994, 512456, 3698699, 26696370, 192687348, 1390767557, 10038200482, 72453134112, 522947981192, 3774503253017, 27243388115499, 196635728242591, 1419265821803368, 10243893573843252, 73937773981558032]

cp's OEIS Frontend

A222015 Number of n X 2 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without move-in move-out straight through or left turns.

Table of values

List of values