%I A098484
%S A098484 1,1,1,1,7,19,37,61,145,397,979,2107,4591,10915,26857,63649,146347,
%T A098484 339751,808885,1936717,4588705,10803133,25559287,60893551,145231309,
%U A098484 345462145,821110051,1955736379,4668132067,11146642903,26605635949
%N A098484 Expansion of 1/sqrt((1-x)^2-12x^4).
%C A098484 1/sqrt((1-x)^2-4rx^4) expands to sum{k=0..floor(n/2), binomial(n-2k,k)binomial(n-3k,
               k)r^k}
%F A098484 a(n)=sum{k=0..floor(n/2), binomial(n-2k, k)binomial(n-3k, k)3^k}
%Y A098484 Cf. A098481, A098482, A098483.
%Y A098484 Sequence in context: A003215 A133323 A002407 this_sequence A155443 A155405 
               A155448
%Y A098484 Adjacent sequences: A098481 A098482 A098483 this_sequence A098485 A098486 
               A098487
%K A098484 easy,nonn
%O A098484 0,5
%A A098484 Paul Barry (pbarry(AT)wit.ie), Sep 10 2004