A220594 Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly two king-move neighbors

1, 3265, 1250507, 702811381, 353961472626, 182840438017294, 93925801702787503, 48312654881049643091, 24842927169574264721081, 12775438144927995432249662, 6569640758436558031667183035, 3378384877381292120618137236108

Offset

1,2

Comments

Column 6 of A220595

Links

R. H. Hardin, Table of n, a(n) for n = 1..31

Example

Some solutions for n=3 0=self 1=nw 2=n 3=ne 4=w 6=e 7=sw 8=s 9=se (reciprocal directions total 10)
.00.89.89.00.00.78...00.89.79.69.46.48...00.68.47.69.46.47...00.69.46.48.00.00
.00.29.12.17.37.27...00.23.18.19.16.24...00.23.69.47.13.00...00.89.17.26.47.78
.00.00.13.36.34.00...00.00.26.46.14.00...00.00.36.14.00.00...00.23.16.34.36.24

Crossrefs

Sequence in context: A251277 A328148 A286008 * A101706 A251273 A184204

Adjacent sequences: A220591 A220592 A220593 * A220595 A220596 A220597

Keyword

nonn

Author

R. H. Hardin Dec 16 2012

Status

approved