A185496 - OEIS

%I #4 Mar 31 2012 12:36:02

%S 11828,3480976,504455124,85864759616,14183811777874,2389300393136984

%N Number of (n+1)X9 binary arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum

%C Column 8 of A185497

%e Some solutions for 4X9

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 29 2011