A251868 - OEIS

%I #5 Dec 10 2014 09:14:03

%S 1038,5632,7080,13152,107040,309144,893120,19032128,165273152,

%T 765683904,31543581824,1017632821376,5776714371584,549951279116416,

%U 49897575625330816,312701410177607424,75341988071758426368

%N 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

%C Diagonal of A251876

%H R. H. Hardin, <a href="/A251868/b251868.txt">Table of n, a(n) for n = 1..18</a>

%e Some solutions for n=4

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 10 2014