A221883 - cp's OEIS frontend

A221883 Number of n X 2 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without consecutive moves in the same direction.

n	a(n)
1	3
2	33
3	326
4	3223
5	31832
6	314426
7	3105733
8	30676867
9	303010527
10	2992984402
11	29563182686
12	292010132356
13	2884328060800
14	28489930453209
15	281409090823688
16	2779616346494657
17	27455641219994600
18	271192906082774221

[3, 33, 326, 3223, 31832, 314426, 3105733, 30676867, 303010527, 2992984402, 29563182686, 292010132356, 2884328060800, 28489930453209, 281409090823688, 2779616346494657, 27455641219994600, 271192906082774221]

cp's OEIS Frontend

A221883 Number of n X 2 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without consecutive moves in the same direction.

Table of values

List of values