%I A026019
%S A026019 1,3,15,83,483,2898,17748,110295,692967,4390815,28009215,179652564,
%T A026019 1157534420,7486680048,48579667704,316107403839,2061920664351,
%U A026019 13478362911825,88272020923485,579081767982795,3804622827123195
%N A026019 C(3n,n) - C(3n,n-3).
%Y A026019 a(n) = T(3n, n), where T is the array defined in A026009.
%Y A026019 Sequence in context: A014276 A006964 A052451 this_sequence A118356 A074552 
               A115910
%Y A026019 Adjacent sequences: A026016 A026017 A026018 this_sequence A026020 A026021 
               A026022
%K A026019 nonn,easy
%O A026019 0,2
%A A026019 Clark Kimberling (ck6(AT)evansville.edu)
%E A026019 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 17 2005