A220683 - cp's OEIS frontend

A220683 Number of ways to reciprocally link elements of an n X 3 array either to themselves or to exactly two horizontal, vertical or antidiagonal neighbors.

n	a(n)
1	1
2	12
3	94
4	745
5	5851
6	46027
7	362057
8	2847943
9	22401961
10	176214299
11	1386105209
12	10903131303
13	85764249269
14	674623302927
15	5306600415489
16	41741825175435
17	328342033045001
18	2582745009614887
19	20315923985816277
20	159805465061769263

[1, 12, 94, 745, 5851, 46027, 362057, 2847943, 22401961, 176214299, 1386105209, 10903131303, 85764249269, 674623302927, 5306600415489, 41741825175435, 328342033045001, 2582745009614887, 20315923985816277, 159805465061769263]

cp's OEIS Frontend

A220683 Number of ways to reciprocally link elements of an n X 3 array either to themselves or to exactly two horizontal, vertical or antidiagonal neighbors.

Table of values

List of values