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 A215844 Number of horizontal, vertical, 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, 4, 8, 102, 364, 8460, 40612, 1440676, 8520924, 419195864, 2916070032, 187464151920, 1489852279864, 120167989574768, 1069484429786480, 105066789765860688, 1031932540617115200, 120715131903960979168 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Column 3 of A215847 LINKS R. H. Hardin, Table of n, a(n) for n = 1..42 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..0....3..x..4....1..x..3....3..x..4....3..x..0....3..x..4....1..x..0 ..x..1..x....x..1..x....x..4..x....x..5..x....x..4..x....x..0..x....x..3..x CROSSREFS Sequence in context: A071277 A336795 A273060 * A111100 A105036 A012940 Adjacent sequences: A215841 A215842 A215843 * A215845 A215846 A215847 KEYWORD nonn AUTHOR R. H. Hardin Aug 24 2012 STATUS approved

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Last modified March 2 15:08 EST 2024. Contains 370494 sequences. (Running on oeis4.)