A284335 - cp's OEIS frontend

A284335 Number of 2 X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

n	a(n)
1	2
2	4
3	13
4	34
5	118
6	419
7	1481
8	5394
9	19848
10	73880
11	277222
12	1047495
13	3977615
14	15169751
15	58074521
16	223081286
17	859450114
18	3319751314
19	12852496680
20	49860496892
21	193783946748
22	754379484650
23	2941051327294
24	11481400024511
25	44875877924939

[2, 4, 13, 34, 118, 419, 1481, 5394, 19848, 73880, 277222, 1047495, 3977615, 15169751, 58074521, 223081286, 859450114, 3319751314, 12852496680, 49860496892, 193783946748, 754379484650, 2941051327294, 11481400024511, 44875877924939]

cp's OEIS Frontend

A284335 Number of 2 X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

Table of values

List of values