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A141512 Number of n X n binary matrices, symmetric about the diagonal and under 90-degree rotation, with no more than 3 ones in any 2 X 2 subblock. 1

%I

%S 1,2,1,7,4,49,21,648,245,16475,5184,801489,214175,74700792,16831269,

%T 13333992705,2539826928,4558747755857,733369598775,2985167883475040,

%U 405728550271273,3743977846899435969,429864175220405760

%N Number of n X n binary matrices, symmetric about the diagonal and under 90-degree rotation, with no more than 3 ones in any 2 X 2 subblock.

%H R. H. Hardin, <a href="/A141512/b141512.txt">Table of n, a(n) for n = 0..30</a>

%K nonn

%O 0,2

%A _R. H. Hardin_, Aug 10 2008

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Last modified January 25 19:00 EST 2022. Contains 350572 sequences. (Running on oeis4.)