Search: id:A000784
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%I A000784 M0322 N0119
%S A000784 0,1,2,2,4,6,6,11,16,20,28,41,51,70,93,122,158,211,266,350,450,577,730,
%T A000784 948,1186,1510,1901,2408,2999,3790,4703,5898,7310,9111,11231,13979,
%U A000784 17168,21229,26036,32095,39188,48155,58657,71798,87262,106472,129014
%N A000784 Symmetrical planar partitions of n: planar partitions (A000219) that 
               when regarded as 3-D objects have just one symmetry plane).
%D A000784 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A000784 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A000784 P. A. MacMahon, Combinatory Analysis. Cambridge Univ. Press, London and 
               New York, Vol. 1, 1915 and Vol. 2, 1916; see vol. 2, p 332.
%H A000784 P. A. MacMahon, <a href="http://www.hti.umich.edu/cgi/t/text/text-idx?c=umhistmath;
               idno=ABU9009">Combinatory analysis</a>.
%Y A000784 Equals -A048141+2*A048140-A000219. Cf. A000785, A000786, A005987, A048142.
%Y A000784 Sequence in context: A008130 A055388 A065457 this_sequence A092991 A102425 
               A162608
%Y A000784 Adjacent sequences: A000781 A000782 A000783 this_sequence A000785 A000786 
               A000787
%K A000784 nonn,nice
%O A000784 1,3
%A A000784 N. J. A. Sloane (njas(AT)research.att.com).
%E A000784 More terms from Wouter Meeussen (wouter.meeussen(AT)pandora.be).

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