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A187308 Half the number of (n+2) X (n+2) binary arrays with each 3 X 3 subblock having sum 3, 4, 5 or 6. 0

%I #9 Jul 07 2014 11:14:48

%S 210,18792,5422402,5243407780,16720419105846,176072290483114471,

%T 6123962812371625570408

%N Half the number of (n+2) X (n+2) binary arrays with each 3 X 3 subblock having sum 3, 4, 5 or 6.

%C Diagonal of A187317.

%e Some solutions for 4 X 4 with a(1,1)=0:

%e ..0..1..1..0....0..1..0..1....0..1..1..1....0..0..0..1....0..0..1..0

%e ..1..0..0..1....0..0..0..1....1..0..0..0....0..1..0..0....0..0..1..1

%e ..1..1..0..1....1..0..1..0....1..1..1..0....1..0..1..0....1..1..0..0

%e ..1..1..1..0....1..0..0..1....1..1..0..0....0..0..1..1....0..0..1..0

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 08 2011

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Last modified March 28 07:33 EDT 2024. Contains 371235 sequences. (Running on oeis4.)