A220598 - cp's OEIS frontend

A220598 Number of ways to reciprocally link elements of an nX4 array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without 3-loops.

n	a(n)
1	1
2	17
3	471
4	9047
5	167614
6	3174778
7	60138423
8	1137615308
9	21523535122
10	407249783145
11	7705461280893
12	145792738613760
13	2758505816300670
14	52192947928719778
15	987528662199324496
16	18684763495713245969

[1, 17, 471, 9047, 167614, 3174778, 60138423, 1137615308, 21523535122, 407249783145, 7705461280893, 145792738613760, 2758505816300670, 52192947928719778, 987528662199324496, 18684763495713245969]

cp's OEIS Frontend

A220598 Number of ways to reciprocally link elements of an nX4 array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without 3-loops.

Table of values

List of values