A220710 - cp's OEIS frontend

A220710 Number of ways to reciprocally link elements of an 5 X n array either to themselves or to exactly two horizontal and antidiagonal neighbors, without consecutive collinear links.

n	a(n)
1	1
2	1
3	8
4	28
5	107
6	405
7	1520
8	5706
9	21418
10	80390
11	301736
12	1132543
13	4250895
14	15955408
15	59887275
16	224782132
17	843701335
18	3166765105
19	11886195940
20	44613876758
21	167454575870
22	628527215306
23	2359126067724
24	8854788952291
25	33235734276043

[1, 1, 8, 28, 107, 405, 1520, 5706, 21418, 80390, 301736, 1132543, 4250895, 15955408, 59887275, 224782132, 843701335, 3166765105, 11886195940, 44613876758, 167454575870, 628527215306, 2359126067724, 8854788952291, 33235734276043]

cp's OEIS Frontend

A220710 Number of ways to reciprocally link elements of an 5 X n array either to themselves or to exactly two horizontal and antidiagonal neighbors, without consecutive collinear links.

Table of values

List of values