A221894 - cp's OEIS frontend

A221894 Number of n X 2 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns.

n	a(n)
1	3
2	31
3	266
4	2305
5	19936
6	172624
7	1494152
8	12933821
9	111957318
10	969123166
11	8388906524
12	72615905296
13	628576515760
14	5441072941952
15	47098919537873
16	407696835820987
17	3529098152699791
18	30548517126329090
19	264433534642030465

[3, 31, 266, 2305, 19936, 172624, 1494152, 12933821, 111957318, 969123166, 8388906524, 72615905296, 628576515760, 5441072941952, 47098919537873, 407696835820987, 3529098152699791, 30548517126329090, 264433534642030465]

cp's OEIS Frontend

A221894 Number of n X 2 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns.

Table of values

List of values