The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #3 Apr 13 2013 07:37:39
%S 6162817,1477939,1800748,1978918,2061018,2097855,2114887,2124211,
%T 2665911,3563511
%N Number of (n+6)X9 0..2 matrices with each 7X7 subblock idempotent
%C Column 3 of A224642
%e Some solutions for n=2
%e ..1..0..0..0..0..0..0..0..2....1..1..1..0..2..2..2..0..2
%e ..1..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
%e ..1..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
%e ..0..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
%e ..1..0..0..0..0..0..0..0..2....0..0..0..0..0..0..0..0..0
%e ..2..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
%e ..0..0..0..0..0..0..0..0..1....0..0..0..0..0..0..0..0..0
%e ..0..0..0..0..0..0..0..0..1....2..1..0..1..0..2..1..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Apr 13 2013