A185828 - cp's OEIS frontend

A185828 Half the number of n X 2 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

n	a(n)
1	1
2	3
3	10
4	23
5	61
6	162
7	421
8	1103
9	2890
10	7563
11	19801
12	51842
13	135721
14	355323
15	930250
16	2435423
17	6376021
18	16692642
19	43701901
20	114413063
21	299537290
22	784198803
23	2053059121
24	5374978562
25	14071876561
26	36840651123
27	96450076810
28	252509579303

[1, 3, 10, 23, 61, 162, 421, 1103, 2890, 7563, 19801, 51842, 135721, 355323, 930250, 2435423, 6376021, 16692642, 43701901, 114413063, 299537290, 784198803, 2053059121, 5374978562, 14071876561, 36840651123, 96450076810, 252509579303]

cp's OEIS Frontend

A185828 Half the number of n X 2 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

Table of values

List of values