login
A216457
Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of an nX3 array with new integer colors introduced in row major order
1
1, 1, 7, 20, 322, 1335, 36401, 192713, 7712455, 49055292, 2659544320, 19602119017, 1367160898137, 11399696350555, 986429423363481, 9146845346099410, 955922762706415420, 9731199828137067515, 1203020866861467699281
OFFSET
1,3
COMMENTS
Column 3 of A216460
LINKS
EXAMPLE
Some solutions for n=4
..0..x..1....0..x..1....0..x..1....0..x..1....0..x..1....0..x..1....0..x..1
..x..2..x....x..2..x....x..2..x....x..2..x....x..2..x....x..2..x....x..2..x
..3..x..4....0..x..1....1..x..3....0..x..3....3..x..4....3..x..4....3..x..1
..x..1..x....x..2..x....x..4..x....x..2..x....x..0..x....x..2..x....x..0..x
CROSSREFS
Sequence in context: A299676 A300308 A344849 * A266048 A233331 A158280
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 07 2012
STATUS
approved