A221729 - cp's OEIS frontend

A221729 Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with every occupancy equal to zero or two.

n	a(n)
1	0
2	16
3	0
4	540
5	0
6	22180
7	0
8	911081
9	0
10	37357844
11	0
12	1530451369
13	0
14	62678117602
15	0
16	2566608259733
17	0
18	105095354454990
19	0
20	4303284726664321
21	0
22	176203240002820998
23	0
24	7214839389152381265
25	0
26	295419432979789366510
27	0
28	12096265452242634926017

[0, 16, 0, 540, 0, 22180, 0, 911081, 0, 37357844, 0, 1530451369, 0, 62678117602, 0, 2566608259733, 0, 105095354454990, 0, 4303284726664321, 0, 176203240002820998, 0, 7214839389152381265, 0, 295419432979789366510, 0, 12096265452242634926017]

cp's OEIS Frontend

A221729 Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with every occupancy equal to zero or two.

Table of values

List of values