A224576 - OEIS

%I #4 Apr 10 2013 18:35:47

%S 28708,7843,8294,9164,9946,10561,11032,12921,16072,20202,25024,30332,

%T 35979,43392,53814,68241,87358,111648,141447,178530,225887,287540,

%U 368172,472953,607389,778773,997360,1277463,1638054,2103279,2702790,3473544

%N Number of (n+5)X12 0..1 matrices with each 6X6 subblock idempotent

%C Column 7 of A224577

%H R. H. Hardin, <a href="/A224576/b224576.txt">Table of n, a(n) for n = 1..192</a>

%F Empirical: a(n) = 3*a(n-1) -3*a(n-2) +a(n-3) +2*a(n-6) -5*a(n-7) +4*a(n-8) -a(n-9) -a(n-12) +2*a(n-13) -a(n-14) for n>18

%e Some solutions for n=2

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

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Apr 10 2013