%I A006067 M3769
%S A006067 1,1,1,5,7,37,104,782
%N A006067 Number of ways to quarter an n X n chessboard.
%D A006067 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A006067 Popular Computing, Vol. 1 (No. 7, 1973), front cover and page 2.
%D A006067 T. R. Parkin, personal communication.
%D A006067 M. Gardner, The Unexpected Hanging and Other Mathematical Diversions. 
               Simon and Schuster, NY, 1969, p. 189.
%H A006067 <a href="a3213.jpg">Illustration showing that a(6) = 37.</a>
%Y A006067 Cf. A003213.
%Y A006067 Sequence in context: A066172 A018353 A081851 this_sequence A147760 A154148 
               A153376
%Y A006067 Adjacent sequences: A006064 A006065 A006066 this_sequence A006068 A006069 
               A006070
%K A006067 nonn,nice
%O A006067 1,4
%A A006067 N. J. A. Sloane (njas(AT)research.att.com).