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 A215921 Number of diagonal and antidiagonal neighbor colorings of the odd squares of an nX3 array with new integer colors introduced in row major order 1
 1, 2, 4, 42, 136, 2906, 12840, 433252, 2387180, 113503692, 742181112, 46538017584, 350038464728, 27700815674032, 234578644301776, 22702140562948192, 213078984368820288, 24626774613248937584, 253140626416265149920 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 3 of A215924 LINKS R. H. Hardin, Table of n, a(n) for n = 1..98 EXAMPLE Some solutions for n=4 ..x..0..x....x..0..x....x..0..x....x..0..x....x..0..x....x..0..x....x..0..x ..1..x..2....1..x..1....1..x..2....1..x..1....1..x..2....1..x..2....1..x..1 ..x..3..x....x..2..x....x..0..x....x..2..x....x..0..x....x..3..x....x..2..x ..1..x..1....3..x..1....3..x..4....1..x..1....2..x..2....4..x..5....0..x..1 CROSSREFS Sequence in context: A103105 A018312 A009547 * A009811 A009591 A009717 Adjacent sequences:  A215918 A215919 A215920 * A215922 A215923 A215924 KEYWORD nonn AUTHOR R. H. Hardin Aug 27 2012 STATUS approved

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Last modified December 1 09:28 EST 2020. Contains 338833 sequences. (Running on oeis4.)