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A251771 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum 3 or 6 and every diagonal and antidiagonal sum not 3 or 6 1

%I #5 Dec 08 2014 10:10:34

%S 470,4182,43778,524774,39849294,1752287522,63113882510,43476743042654,

%T 6284003474380930,629437620309947966,4375644728066201664158,

%U 1886133341869265972224930,508745180020891822952693150

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

%C Diagonal of A251779

%H R. H. Hardin, <a href="/A251771/b251771.txt">Table of n, a(n) for n = 1..14</a>

%e Some solutions for n=3

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 08 2014

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Last modified March 28 08:02 EDT 2024. Contains 371236 sequences. (Running on oeis4.)