%I #6 Mar 09 2015 00:18:00
%S 1,2,3,57,128,22077,65205,114142368,468343535,7969215344753,
%T 44467930404864,7479088292930771309,57134805472751200753,
%U 94492733598842569249024512,986251920362343910672065291
%N Number of n X n binary matrices, symmetric under horizontal reflection, with no more than 3 ones in any 2 X 2 subblock.
%H R. H. Hardin, <a href="/A141509/b141509.txt">Table of n, a(n) for n = 0..31</a>
%K nonn
%O 0,2
%A _R. H. Hardin_, Aug 10 2008
