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 A193310 Number of n X n symmetric 0..4 arrays with no element equal to any horizontal or vertical neighbor, containing at least one 4 and with new values 0..4 introduced in lower triangular row major order 1
 0, 0, 9, 4369, 3042328, 5698808287, 33317286304173, 628998137157508637, 38569165397999629055394, 7686739047191692875345982285, 4979433998253869605167632947630885 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS R. H. Hardin, Table of n, a(n) for n = 1..12 EXAMPLE Some solutions for 4X4 ..0..1..3..2....0..1..2..3....0..1..0..4....0..1..2..4....0..1..2..0 ..1..2..0..1....1..0..3..2....1..2..3..0....1..2..0..1....1..0..1..2 ..3..0..4..0....2..3..2..3....0..3..2..1....2..0..3..4....2..1..3..4 ..2..1..0..2....3..2..3..4....4..0..1..3....4..1..4..0....0..2..4..2 CROSSREFS Sequence in context: A036516 A024126 A163018 * A216421 A323337 A167064 Adjacent sequences: A193307 A193308 A193309 * A193311 A193312 A193313 KEYWORD nonn AUTHOR R. H. Hardin Jul 22 2011 STATUS approved

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Last modified June 15 19:43 EDT 2024. Contains 373410 sequences. (Running on oeis4.)