A221938 - cp's OEIS frontend

A221938 Number of 2 X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns.

n	a(n)
1	1
2	17
3	105
4	783
5	5622
6	40608
7	293084
8	2115379
9	15268366
10	110202874
11	795416273
12	5741108247
13	41437835079
14	299087573904
15	2158736742330
16	15581203397143
17	112461095655909
18	811715097631008
19	5858749604657939
20	42286939137094085

[1, 17, 105, 783, 5622, 40608, 293084, 2115379, 15268366, 110202874, 795416273, 5741108247, 41437835079, 299087573904, 2158736742330, 15581203397143, 112461095655909, 811715097631008, 5858749604657939, 42286939137094085]

cp's OEIS Frontend

A221938 Number of 2 X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns.

Table of values

List of values