Search: id:A124861
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%I A124861
%S A124861 1,1,4,11,29,80,219,597,1632,4459,12181,33280,90923,248405,678656,
%T A124861 1854123,5065557,13839360,37809835,103298389,282216448,771029675,
%U A124861 2106492245,5755043840,15723072171,42956232021,117358608384
%N A124861 Expansion of 1/(1-x-3x^2-4x^3-2x^4).
%C A124861 Diagonal sums of number triangle A124860.
%F A124861 a(n)=a(n-1)+3a(n-2)-4a(n-3)-2a(n-4); a(n)=sum{k=0..floor(n/2), J(n-k+1)C(n-k,
               k)} where J(n)=A001045(n).
%Y A124861 Sequence in context: A027972 A002878 A098149 this_sequence A110579 A084378 
               A099065
%Y A124861 Adjacent sequences: A124858 A124859 A124860 this_sequence A124862 A124863 
               A124864
%K A124861 easy,nonn
%O A124861 0,3
%A A124861 Paul Barry (pbarry(AT)wit.ie), Nov 10 2006

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