%I A123026
%S A123026 1,1,1,2,7,28,161,952,7567,59024,597793,5784352,71137367,821377984,11879940289,
%T A123026 159347328896,2649226684447,40474221539584,760328058436289,13032699335746048,
%U A123026 272957772978627751,5187014335626927104,119828462337617582689,2500140909772178864128
%V A123026 1,1,-1,2,-7,28,-161,952,-7567,59024,-597793,5784352,-71137367,821377984,
               -11879940289,
%W A123026 159347328896,-2649226684447,40474221539584,-760328058436289,13032699335746048,
%X A123026 -272957772978627751,5187014335626927104,-119828462337617582689,2500140909772178864128
%N A123026 Let a0 = 1; b0 = -2; c0 = -1; a(n) = a(n-2)*(a0*n^2+b0*n+c0)/(n*(n-1)).
%t A123026 a0 = 1; b0 = -2; c0 = -1; a[n_] := a[n] = (a0*n^2 + b0*n + c0)*a[n - 
               2]/(n*(n - 1)); a[0] = 1; a[1] = 1; Table[ExpandAll[a[n]*n! ], {n, 
               0, 30}]
%Y A123026 Sequence in context: A030897 A030946 A030906 this_sequence A013011 A013181 
               A122118
%Y A123026 Adjacent sequences: A123023 A123024 A123025 this_sequence A123027 A123028 
               A123029
%K A123026 sign
%O A123026 0,4
%A A123026 Roger Bagula (rlbagulatftn(AT)yahoo.com), Sep 24 2006
%E A123026 Edited by N. J. A. Sloane (njas(AT)research.att.com), Oct 01 2006