Search: id:A099745
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%I A099745
%S A099745 0,0,0,0,12,168,1409,9187,51362,258674,1207855,5326205,22459080,
%T A099745 91368900,360977373,1391835607,5257593566,19515948358,71358739003,
%U A099745 257521313441,918732810340,3244576312440,11355547678665,39423281302875
%N A099745 Number of permutations of [n] with exactly 2 valleys which avoid the 
               permutation 1324.
%F A099745 G.f.: x^5*(12-72*x+137*x^2-81*x^3)/((1-3*x)^4*(1-2*x)^4).
%Y A099745 Cf. A000079.
%Y A099745 Sequence in context: A046174 A055760 A056591 this_sequence A079679 A113380 
               A071103
%Y A099745 Adjacent sequences: A099742 A099743 A099744 this_sequence A099746 A099747 
               A099748
%K A099745 nonn
%O A099745 1,5
%A A099745 Mike Zabrocki (zabrocki(AT)mathstat.yorku.ca), Nov 09 2004

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