A215846 Number of horizontal, vertical, diagonal and antidiagonal neighbor colorings of the even squares of an n X 7 array with new integer colors introduced in row major order.

1, 5, 52, 8460, 908408, 1590366402, 621070325112, 3815473909467500, 3338879032079931702, 49279739016010612438482, 78078252717220869748888110, 2271020746204851403136701359870, 5766825640795432616276139021743234, 292268929366529401852293167022121562170

Offset

0,2

Links

Andrew Howroyd, Table of n, a(n) for n = 0..50

Example

Some solutions for n=3:
..0..x..1..x..2..x..3....0..x..1..x..2..x..3....0..x..1..x..2..x..3
..x..3..x..4..x..5..x....x..2..x..4..x..5..x....x..4..x..0..x..5..x
..1..x..2..x..0..x..1....6..x..7..x..0..x..6....3..x..5..x..6..x..4

Crossrefs

Column 7 of A215847.

Sequence in context: A223248 A208303 A215902 * A216459 A107803 A255579

Adjacent sequences: A215843 A215844 A215845 * A215847 A215848 A215849

Keyword

nonn

Author

R. H. Hardin, Aug 24 2012

Extensions

a(0)=1 prepended and terms a(7) and beyond from Andrew Howroyd, Jun 26 2017

Status

approved