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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
1, 5, 52, 8460, 908408, 1590366402, 621070325112, 3815473909467500, 3338879032079931702, 49279739016010612438482, 78078252717220869748888110, 2271020746204851403136701359870, 5766825640795432616276139021743234, 292268929366529401852293167022121562170
OFFSET
0,2
LINKS
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
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