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Search: id:A084103
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%I A084103
%S A084103 1,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,
%T A084103 3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,
%U A084103 3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3,0,3,3
%V A084103 1,3,3,0,-3,-3,0,3,3,0,-3,-3,0,3,3,0,-3,-3,0,3,3,0,-3,-3,0,3,3,0,-3,-3,
               0,3,3,0,-3,-3,0,
%W A084103 3,3,0,-3,-3,0,3,3,0,-3,-3,0,3,3,0,-3,-3,0,3,3,0,-3,-3,0,3,3,0,-3,-3,0,
               3,3,0,-3,-3,0,3,
%X A084103 3,0,-3,-3,0,3,3,0,-3,-3,0,3,3,0,-3,-3
%N A084103 Expansion of (1+x)^3/(1+x^3).
%C A084103 Partial sums are A084104.
%F A084103 a(n)=sum{k=0..n, binomial(2n-k-1, k)(-1)^k*3(n-k)} - Paul Barry (pbarry(AT)wit.ie), 
               Jan 21 2005
%Y A084103 Sequence in context: A098316 A160165 A084055 this_sequence A036477 A128164 
               A140686
%Y A084103 Adjacent sequences: A084100 A084101 A084102 this_sequence A084104 A084105 
               A084106
%K A084103 easy,sign
%O A084103 0,2
%A A084103 Paul Barry (pbarry(AT)wit.ie), May 15 2003

    
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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