A200801 - cp's OEIS frontend

A200801 T(n,k) is the number of n X k 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.

n	a(n)
1	1
2	2
3	2
4	5
5	15
6	5
7	15
8	178
9	178
10	15
11	51
12	2614
13	9880
14	2614
15	51
16	187
17	40148
18	583813
19	583813
20	40148
21	187
22	715
23	622645
24	34679839
25	132636590
26	34679839
27	622645
28	715
29	2795
30	9676364
31	2060918000
32	30147154218
33	30147154218
34	2060918000
35	9676364
36	2795

[1, 2, 2, 5, 15, 5, 15, 178, 178, 15, 51, 2614, 9880, 2614, 51, 187, 40148, 583813, 583813, 40148, 187, 715, 622645, 34679839, 132636590, 34679839, 622645, 715, 2795, 9676364, 2060918000, 30147154218, 30147154218, 2060918000, 9676364, 2795]

cp's OEIS Frontend

A200801 T(n,k) is the number of n X k 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.

Table of values

List of values