637840

Appears in sequences

• a(n) = Sum_{k=0..n} C(n+k,2k)*A000108(k)*3^k*2^(n-k).at n=6A152601
• a(n) = Sum_{k=0..floor(n/3)} 2^(n-3*k) * binomial(2*k+1,2*n-6*k).at n=29A387650