A185825 - cp's OEIS frontend

A185825 T(n,k)=1/5 the number of nXk 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

n	a(n)
1	0
2	1
3	1
4	1
5	9
6	1
7	5
8	76
9	76
10	5
11	9
12	656
13	1584
14	656
15	9
16	29
17	5680
18	49036
19	49036
20	5680
21	29
22	65
23	49248
24	1266624
25	4443292
26	1266624
27	49248
28	65
29	181
30	426928
31	35446376
32	378212944
33	378212944
34	35446376
35	426928
36	181
37	441
38	3701360
39	956312244
40	32995092992

[0, 1, 1, 1, 9, 1, 5, 76, 76, 5, 9, 656, 1584, 656, 9, 29, 5680, 49036, 49036, 5680, 29, 65, 49248, 1266624, 4443292, 1266624, 49248, 65, 181, 426928, 35446376, 378212944, 378212944, 35446376, 426928, 181, 441, 3701360, 956312244, 32995092992]

cp's OEIS Frontend

A185825 T(n,k)=1/5 the number of nXk 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

Table of values

List of values