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 A251783 Number of (n+2) X (n+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3 X 3 subblock summing to 2, 3, 6, or 7. 0

%I #6 Oct 01 2021 17:27:38

%S 1280,2640,16710,149364,2432344,52977162,2223220200,171503981892,

%T 20081331006806,3867096597138664,1162903308152378970,

%U 538715029223098678532

%N Number of (n+2) X (n+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3 X 3 subblock summing to 2, 3, 6, or 7.

%C Diagonal of A251791.

%e Some solutions for n=4

%e ..2..2..1..1..2..2....0..3..2..0..2..2....0..0..0..0..0..0....0..3..1..0..3..2

%e ..3..3..3..3..3..3....1..3..1..0..3..1....2..2..1..1..2..2....3..1..0..3..1..0

%e ..0..0..0..0..0..0....0..3..2..0..3..2....3..3..3..3..3..2....2..0..3..2..0..3

%e ..1..2..1..2..1..2....0..3..1..0..3..1....0..0..0..0..0..1....0..3..2..0..3..2

%e ..3..3..3..3..3..3....0..3..2..0..3..2....2..1..2..2..1..1....3..1..0..3..1..0

%e ..0..0..0..0..0..0....1..3..1..0..3..1....3..3..3..3..3..3....2..0..3..1..0..3

%Y Cf. A251791.

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 08 2014

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Last modified September 27 14:11 EDT 2023. Contains 365711 sequences. (Running on oeis4.)