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A216461
Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of a 3Xn array with new integer colors introduced in row major order
1
2, 2, 7, 15, 203, 716, 17733, 83440, 3137543, 18171918, 942426468, 6423127757, 433245459699, 3376465219485, 284615058572536, 2486327138729353, 254421641605158901, 2454996141671330713, 298288744434946125073
OFFSET
1,1
COMMENTS
Row 3 of A216460
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..0....x..2..x..3....x..2..x..3....x..2..x..3....x..2..x..0
..0..x..3..x....3..x..4..x....4..x..5..x....0..x..1..x....3..x..4..x
CROSSREFS
Sequence in context: A290646 A133602 A137249 * A238833 A192921 A051769
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 07 2012
STATUS
approved