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 A251868 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 4 5 or 7 and every diagonal and antidiagonal sum 2 4 5 or 7 1
 1038, 5632, 7080, 13152, 107040, 309144, 893120, 19032128, 165273152, 765683904, 31543581824, 1017632821376, 5776714371584, 549951279116416, 49897575625330816, 312701410177607424, 75341988071758426368 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A251876 LINKS R. H. Hardin, Table of n, a(n) for n = 1..18 EXAMPLE Some solutions for n=4 ..3..1..2..0..1..2....3..3..3..3..3..0....2..1..3..2..1..0....2..3..1..2..0..1 ..3..0..3..3..3..0....3..2..1..0..2..1....1..2..0..1..2..3....1..1..1..1..1..1 ..3..2..1..0..2..1....0..1..2..3..1..2....0..3..3..3..0..0....3..2..1..3..2..1 ..0..1..2..3..1..2....3..3..0..3..0..3....2..1..0..2..1..3....2..3..1..2..0..1 ..3..3..0..3..0..3....0..2..1..3..2..1....1..2..3..1..2..3....1..1..1..1..1..1 ..0..2..1..3..2..1....0..1..2..0..1..2....0..0..3..0..3..0....3..2..1..3..2..1 CROSSREFS Sequence in context: A065572 A251876 A251869 * A074673 A235156 A288413 Adjacent sequences:  A251865 A251866 A251867 * A251869 A251870 A251871 KEYWORD nonn AUTHOR R. H. Hardin, Dec 10 2014 STATUS approved

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Last modified May 22 12:28 EDT 2022. Contains 353950 sequences. (Running on oeis4.)