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 A193269 Number of n X n symmetric 0..3 arrays with no element equal to any horizontal or vertical neighbor and with new values 0..3 introduced in lower triangular row major order 1
 1, 2, 32, 1544, 176621, 47206184, 29472402866, 42983827798496, 146444618198769125, 1165528963636440929600, 21669813287735290595660642, 941174635410204103533009279920, 95492317441878732465782043745326917 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS R. H. Hardin, Table of n, a(n) for n = 1..15 EXAMPLE Some solutions for 4X4 ..0..1..2..1....0..1..0..3....0..1..2..3....0..1..0..3....0..1..2..3 ..1..0..3..0....1..2..3..0....1..0..3..1....1..0..1..2....1..2..3..2 ..2..3..0..2....0..3..2..1....2..3..2..0....0..1..2..3....2..3..1..3 ..1..0..2..3....3..0..1..2....3..1..0..1....3..2..3..2....3..2..3..0 CROSSREFS Sequence in context: A129348 A280211 A087084 * A088386 A329928 A093584 Adjacent sequences:  A193266 A193267 A193268 * A193270 A193271 A193272 KEYWORD nonn AUTHOR R. H. Hardin Jul 20 2011 STATUS approved

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Last modified April 4 20:53 EDT 2020. Contains 333229 sequences. (Running on oeis4.)