A218420 - cp's OEIS frontend

A218420 Hilltop maps: number of n X 2 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..1 n X 2 array.

n	a(n)
1	3
2	13
3	49
4	191
5	737
6	2849
7	11011
8	42557
9	164481
10	635711
11	2456993
12	9496161
13	36702211
14	141852301
15	548252401
16	2118969471
17	8189716289
18	31652864193
19	122336815619
20	472825977597
21	1827449929601
22	7063007117695
23	27298186799297
24	105506194473793

[3, 13, 49, 191, 737, 2849, 11011, 42557, 164481, 635711, 2456993, 9496161, 36702211, 141852301, 548252401, 2118969471, 8189716289, 31652864193, 122336815619, 472825977597, 1827449929601, 7063007117695, 27298186799297, 105506194473793]

cp's OEIS Frontend

A218420 Hilltop maps: number of n X 2 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..1 n X 2 array.

Table of values

List of values