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A141509 Number of n X n binary matrices, symmetric under horizontal reflection, with no more than 3 ones in any 2 X 2 subblock. 1

%I

%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

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Last modified May 26 13:59 EDT 2022. Contains 354092 sequences. (Running on oeis4.)