Search: id:A071920
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%I A071920
%S A071920 0,0,0,0,1,0,0,2,1,0,0,3,4,1,0,0,4,9,7,1,0,0,5,16,22,11,1,0,0,6,25,50,
%T A071920 46,16,1,0,0,7,36,95,130,86,22,1,0,0,8,49,161,295,296,148,29,1,0,0,9,
%U A071920 64,252,581,791,610,239,37,1,0
%N A071920 Square array giving number of unimodal functions [n]->[m] for n>=0, m>
               =0, with a(0,m)=0 for all m>=0, read by antidiagonals.
%C A071920 If one uses a definition of unimodality that involves existential quantifiers 
               on the domain of a function then a(0,m)=0 a priori.
%F A071920 a(n, m)=sum_{k=0}^{m-1} binomial(n+2k-1, 2k).
%Y A071920 Sequence in context: A034365 A103778 A099423 this_sequence A065719 A113953 
               A110509
%Y A071920 Adjacent sequences: A071917 A071918 A071919 this_sequence A071921 A071922 
               A071923
%K A071920 nonn,easy,tabl
%O A071920 0,8
%A A071920 Michele Dondi (bik.mido(AT)tiscalinet.it), Jun 14, 2002

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