%I A002881 M4614 N1969
%S A002881 0,0,0,0,0,0,0,0,1,0,0,9,34,104,283,957,3033,9519
%N A002881 Number of imperfect squared rectangles of order n.
%C A002881 The order of a squared rectangle is the number of squares into which 
               it is divided.
%D A002881 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002881 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002881 C. J. Bouwkamp, personal communication.
%D A002881 M. Gardner, The 2nd Scientific American Book of Mathematical Puzzles 
               and Diversions. Simon and Schuster, NY, 1961, p. 207.
%H A002881 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               PerfectRectangle.html">Perfect Rectangle</a>
%Y A002881 Cf. A006983, A002962, A002839, A014530.
%Y A002881 Sequence in context: A147691 A000441 A067989 this_sequence A005344 A050478 
               A154393
%Y A002881 Adjacent sequences: A002878 A002879 A002880 this_sequence A002882 A002883 
               A002884
%K A002881 hard,nonn
%O A002881 1,12
%A A002881 N. J. A. Sloane (njas(AT)research.att.com).