-3104

Appears in sequences

• a(n) = Sum_{k=0..n-1} 9^k*B(k)*binomial(n,k) where B(k) is the k-th Bernoulli number.at n=6A083013
• Inverse of Riordan array (1/(1-x)^2,x(1-x)/(1+x)), A104698.at n=30A110271
• a(n) = Hermite(n,2).at n=7A144141
• The 7th Hermite Polynomial evaluated at n: H_7(n) = 128*n^7 -1344*n^5 + 3360*n^3 - 1680*n.at n=2A247852
• Real parts of the recursive sequence a(n+2) = Sum_{k=0..n} binomial(n,k)*a(k)*a(n+1-k), with a(0)=2, a(1)=2i.at n=7A289088