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A215955
Number of horizontal, vertical and diagonal neighbor colorings of the even squares of an n X 4 array with new integer colors introduced in row major order.
1
1, 4, 29, 313, 6150, 145563, 5219070, 208181894, 11412814314, 670592486703, 51088102234508, 4085932956830052, 407520605922011467, 42123055901071684382, 5279748839226156263229, 679936583636831702045901
OFFSET
1,2
COMMENTS
Column 4 of A215959.
LINKS
EXAMPLE
Some solutions for n=4
..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x
..x..2..x..3....x..1..x..0....x..1..x..2....x..2..x..3....x..2..x..3
..4..x..0..x....2..x..3..x....3..x..4..x....2..x..4..x....2..x..0..x
..x..1..x..2....x..4..x..2....x..5..x..1....x..3..x..5....x..0..x..2
CROSSREFS
Cf. A215959.
Sequence in context: A303928 A201627 A195194 * A295237 A028853 A118795
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 28 2012
STATUS
approved