A220611 - cp's OEIS frontend

A220611 Number of ways to reciprocally link elements of an n X 5 array either to themselves or to exactly two horizontal and vertical neighbors, without consecutive collinear links.

n	a(n)
1	1
2	8
3	21
4	95
5	324
6	1277
7	4673
8	17768
9	66245
10	249499
11	934816
12	3511945
13	13175625
14	49465544
15	185641901
16	696836263
17	2615432756
18	9816980965
19	36846924297
20	138302568456
21	519106314333
22	1948425878179
23	7313254531824
24	27449718110385

[1, 8, 21, 95, 324, 1277, 4673, 17768, 66245, 249499, 934816, 3511945, 13175625, 49465544, 185641901, 696836263, 2615432756, 9816980965, 36846924297, 138302568456, 519106314333, 1948425878179, 7313254531824, 27449718110385]

cp's OEIS Frontend

A220611 Number of ways to reciprocally link elements of an n X 5 array either to themselves or to exactly two horizontal and vertical neighbors, without consecutive collinear links.

Table of values

List of values