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 A265459 Number of n X n 0..2n-2 arrays with upper left zero and lower right 2n-2 and each element differing from its horizontal and antidiagonal neighbors by one or two. 0
 1, 3, 550, 398508, 2002867877, 49094408347776, 6109458550119472926, 3756191694523776480082260, 11421616015549105186265908485988 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A265466. LINKS Table of n, a(n) for n=1..9. EXAMPLE Some solutions for n=3 ..0..2..4....0..2..1....0..2..3....0..2..3....0..1..2....0..2..0....0..2..3 ..3..2..1....3..2..0....3..2..1....0..2..4....2..3..4....0..2..0....3..2..0 ..1..3..4....1..2..4....1..3..4....3..2..4....2..3..4....0..2..4....4..2..4 CROSSREFS Cf. A265466. Sequence in context: A332153 A158247 A034314 * A201431 A171359 A002306 Adjacent sequences: A265456 A265457 A265458 * A265460 A265461 A265462 KEYWORD nonn AUTHOR R. H. Hardin, Dec 09 2015 STATUS approved

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Last modified May 28 21:07 EDT 2023. Contains 363028 sequences. (Running on oeis4.)