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 A216331 Number of horizontal and antidiagonal neighbor colorings of the even squares of an n X n array with new integer colors introduced in row major order 0
 1, 2, 15, 726, 2387180, 37060650272, 148049849072167133, 2765650089185458968363718 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A216338 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..0..x..1....x..0..x..2....x..2..x..0....x..2..x..3....x..0..x..2 ..2..x..3..x....2..x..0..x....1..x..2..x....3..x..2..x....3..x..4..x ..x..2..x..1....x..3..x..4....x..0..x..3....x..1..x..3....x..2..x..5 CROSSREFS Sequence in context: A208051 A038017 A012993 * A179432 A007542 A090604 Adjacent sequences:  A216328 A216329 A216330 * A216332 A216333 A216334 KEYWORD nonn AUTHOR R. H. Hardin Sep 04 2012 STATUS approved

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Last modified June 15 16:13 EDT 2019. Contains 324142 sequences. (Running on oeis4.)