626349395

Appears in sequences

• a(n)=(-1)^(n+1)*2*(16^n-1)*B(2n) where B(k) denotes the k-th Bernoulli number.at n=7A090645
• a(n) = (7*2^n - 9 + 5*(-1)^n) / 6.at n=28A392003