%I A056827
%S A056827 0,0,0,1,2,4,6,8,10,13,16,20,24,28,32,37,42,48,54,60,66,73,80,88,
%T A056827 96,104,112,121,130,140,150,160,170,181,192,204,216,228,240,253,
%U A056827 266,280,294,308,322,337,352,368,384,400,416,433,450,468,486,504
%N A056827 [n^2/6].
%F A056827 G.f.: x^3(1+x^2)/((1+x)(1-x)^3*(1+x+x^2)(1-x+x^2)). a(n+1)-a(n)=A123919(n). 
               [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 22 2008]
%Y A056827 Cf. A000290, A007590, A000212, A002620, A118015, A118013.
%Y A056827 Sequence in context: A165453 A025224 A096182 this_sequence A024172 A085577 
               A121832
%Y A056827 Adjacent sequences: A056824 A056825 A056826 this_sequence A056828 A056829 
               A056830
%K A056827 nonn
%O A056827 0,5
%A A056827 N. J. A. Sloane (njas(AT)research.att.com), Sep 02 2000