A220558 - cp's OEIS frontend

A220558 Number of ways to reciprocally link elements of an n X 4 array either to themselves or to exactly one horizontal or antidiagonal neighbor.

n	a(n)
1	5
2	47
3	430
4	3966
5	36640
6	338581
7	3128843
8	28913910
9	267196106
10	2469184016
11	22817958901
12	210862878471
13	1948603453870
14	18007225586854
15	166406444930000
16	1537777420552101
17	14210744037917219
18	131322806156626838

[5, 47, 430, 3966, 36640, 338581, 3128843, 28913910, 267196106, 2469184016, 22817958901, 210862878471, 1948603453870, 18007225586854, 166406444930000, 1537777420552101, 14210744037917219, 131322806156626838]

cp's OEIS Frontend

A220558 Number of ways to reciprocally link elements of an n X 4 array either to themselves or to exactly one horizontal or antidiagonal neighbor.

Table of values

List of values