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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.)