A220684 - cp's OEIS frontend

A220684 Number of ways to reciprocally link elements of an nX4 array either to themselves or to exactly two horizontal, vertical or antidiagonal neighbors.

n	a(n)
1	1
2	37
3	745
4	15452
5	312603
6	6349886
7	128995678
8	2620320833
9	53226950200
10	1081210102382
11	21962842195925
12	446135673339403
13	9062444632025696
14	184087280486642815
15	3739402357364779367
16	75959240384539034764

[1, 37, 745, 15452, 312603, 6349886, 128995678, 2620320833, 53226950200, 1081210102382, 21962842195925, 446135673339403, 9062444632025696, 184087280486642815, 3739402357364779367, 75959240384539034764]

cp's OEIS Frontend

A220684 Number of ways to reciprocally link elements of an nX4 array either to themselves or to exactly two horizontal, vertical or antidiagonal neighbors.

Table of values

List of values