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A251821 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not 3 or 6 and every diagonal and antidiagonal sum 3 or 6 0

%I #4 Dec 09 2014 12:46:22

%S 1890,8674,130826,1692106,101716526,12583469514,395032012018,

%T 159028764990482,131396089518942658,8109916816692482850,

%U 21693086973745341445330

%N Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not 3 or 6 and every diagonal and antidiagonal sum 3 or 6

%C Diagonal of A251829

%e Some solutions for n=3

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 09 2014

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Last modified July 19 03:15 EDT 2024. Contains 374388 sequences. (Running on oeis4.)