A221447 - cp's OEIS frontend

A221447 Hilltop maps: number of 2 X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..1 2 X n array.

n	a(n)
1	1
2	9
3	33
4	117
5	429
6	1577
7	5785
8	21217
9	77825
10	285473
11	1047145
12	3841029
13	14089277
14	51680881
15	189570641
16	695364065
17	2550664929
18	9356094041
19	34319088593
20	125885849013
21	461761883309
22	1693788766169
23	6212986580521
24	22789856102913

[1, 9, 33, 117, 429, 1577, 5785, 21217, 77825, 285473, 1047145, 3841029, 14089277, 51680881, 189570641, 695364065, 2550664929, 9356094041, 34319088593, 125885849013, 461761883309, 1693788766169, 6212986580521, 22789856102913]

cp's OEIS Frontend

A221447 Hilltop maps: number of 2 X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..1 2 X n array.

Table of values

List of values