A186168 - cp's OEIS frontend

A186168 T(n,k)=1/4 the number of nXk 0..3 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	7
6	1
7	4
8	48
9	48
10	4
11	7
12	321
13	702
14	321
15	7
16	19
17	2175
18	14364
19	14364
20	2175
21	19
22	40
23	14748
24	253341
25	751266
26	253341
27	14748
28	40
29	97
30	99933
31	4762206
32	37402872
33	37402872
34	4762206
35	99933
36	97
37	217
38	677283
39	87054174
40	1899336597
41	5033988714
42	1899336597

[0, 1, 1, 1, 7, 1, 4, 48, 48, 4, 7, 321, 702, 321, 7, 19, 2175, 14364, 14364, 2175, 19, 40, 14748, 253341, 751266, 253341, 14748, 40, 97, 99933, 4762206, 37402872, 37402872, 4762206, 99933, 97, 217, 677283, 87054174, 1899336597, 5033988714, 1899336597]

cp's OEIS Frontend

A186168 T(n,k)=1/4 the number of nXk 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

Table of values

List of values