A220329 - cp's OEIS frontend

A220329 Equals two maps: number of 2Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..1 2Xn array.

n	a(n)
1	1
2	4
3	16
4	48
5	174
6	658
7	2482
8	9229
9	33982
10	125217
11	461351
12	1699127
13	6252129
14	22995280
15	84546207
16	310785413
17	1142206689
18	4197260747
19	15421867303
20	56659522539
21	208152496049
22	764662949438
23	2808941077111
24	10318186228202

[1, 4, 16, 48, 174, 658, 2482, 9229, 33982, 125217, 461351, 1699127, 6252129, 22995280, 84546207, 310785413, 1142206689, 4197260747, 15421867303, 56659522539, 208152496049, 764662949438, 2808941077111, 10318186228202]

cp's OEIS Frontend

A220329 Equals two maps: number of 2Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..1 2Xn array.

Table of values

List of values