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 A230268 Number of n X n 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero 0
 0, 0, 28, 5734, 5524854, 28716109350, 810027275568580, 124090541934393885346 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Diagonal of A230275 LINKS Table of n, a(n) for n=1..8. EXAMPLE Some solutions for n=3 ..0..0..1....0..1..2....0..1..0....0..2..2....0..2..1....0..2..1....0..2..1 ..1..0..2....2..1..0....2..2..2....1..1..0....1..2..0....1..2..0....1..2..0 ..2..0..1....2..0..2....1..0..2....2..0..2....0..1..0....0..2..1....0..1..2 CROSSREFS Sequence in context: A131315 A200999 A221935 * A203328 A159407 A099058 Adjacent sequences: A230265 A230266 A230267 * A230269 A230270 A230271 KEYWORD nonn AUTHOR R. H. Hardin, Oct 14 2013 STATUS approved

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Last modified February 25 06:40 EST 2024. Contains 370310 sequences. (Running on oeis4.)