A221777 - cp's OEIS frontend

A221777 Number of n X 2 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns.

n	a(n)
1	3
2	25
3	184
4	1367
5	10179
6	75782
7	564169
8	4200043
9	31267890
10	232778781
11	1732958641
12	12901286112
13	96045675555
14	715027301353
15	5323134422488
16	39628920498935
17	295023799000179
18	2196351575583206
19	16351088488165993
20	121728277803994939

[3, 25, 184, 1367, 10179, 75782, 564169, 4200043, 31267890, 232778781, 1732958641, 12901286112, 96045675555, 715027301353, 5323134422488, 39628920498935, 295023799000179, 2196351575583206, 16351088488165993, 121728277803994939]

cp's OEIS Frontend

A221777 Number of n X 2 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns.

Table of values

List of values