Search: id:A011891
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%I A011891
%S A011891 0,0,0,0,2,6,13,23,37,56,80,110,146,190,242,303,373,453,
%T A011891 544,646,760,886,1026,1180,1349,1533,1733,1950,2184,2436,
%U A011891 2706,2996,3306,3637,3989,4363,4760,5180,5624,6092,6586
%N A011891 [ n(n-1)(n-2)/9 ].
%F A011891 G.f.:(x^4*(x^5-x^4+x^3+x^2-2*x+2))/((x^6+x^3+1)*(x-1)^4) [From Maksym 
               Voznyy (voznyy(AT)mail.ru), Jul 27 2009]
%F A011891 Third differences are [-2, 4] repeated. - M. F. Hasler, Sep 15 2009
%Y A011891 Sequence in context: A049616 A064960 A143689 this_sequence A003600 A000135 
               A065220
%Y A011891 Adjacent sequences: A011888 A011889 A011890 this_sequence A011892 A011893 
               A011894
%K A011891 nonn
%O A011891 0,5
%A A011891 N. J. A. Sloane (njas(AT)research.att.com).

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