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%I #4 Apr 10 2013 13:50:07
%S 452,340,514,752,974,1550,2526,3918,5716,8536,12978,19670,29226,43204,
%T 63992,94856,139914,205488,301196,441124,644948,940908,1370156,
%U 1992618,2894276,4198330,6081892,8800132,12719614,18365760
%N Number of (n+3)X(n+3) 0..1 matrices with each 4X4 subblock idempotent
%C Diagonal of A224568
%e Some solutions for n=3
%e ..1..1..1..1..0..1....0..1..0..0..0..0....0..0..0..0..0..0....1..1..1..1..1..1
%e ..0..0..0..0..0..0....0..1..0..0..0..0....1..1..1..1..1..1....0..0..0..0..0..0
%e ..0..0..0..0..0..0....0..1..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0
%e ..0..0..0..0..0..0....0..1..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0
%e ..0..0..0..0..0..0....0..1..0..0..0..1....0..0..0..0..0..0....0..0..0..0..0..0
%e ..0..0..0..0..0..0....0..0..0..0..0..1....1..1..1..1..1..1....0..0..0..1..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Apr 10 2013
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