A220640 - cp's OEIS frontend

A220640 Number of ways to reciprocally link elements of an n X 4 array either to themselves or to exactly one king-move neighbor.

n	a(n)
0	1
1	5
2	172
3	3755
4	92801
5	2226936
6	53841725
7	1299348473
8	31371388772
9	757341382671
10	18283618480037
11	441397115736816
12	10656083384666537
13	257256013409077661
14	6210599281867691164
15	149934463555725516099
16	3619673802389322978937
17	87385102146053809399912

[1, 5, 172, 3755, 92801, 2226936, 53841725, 1299348473, 31371388772, 757341382671, 18283618480037, 441397115736816, 10656083384666537, 257256013409077661, 6210599281867691164, 149934463555725516099, 3619673802389322978937, 87385102146053809399912]

cp's OEIS Frontend

A220640 Number of ways to reciprocally link elements of an n X 4 array either to themselves or to exactly one king-move neighbor.

Table of values

List of values