-6636

Appears in sequences

• E.g.f. exp(tan(x)*log(1+x)).at n=7A009249
• Triangle read by rows: T(n,k) is the coefficient A_k in the transformation of 1 + x + x^2 + ... + x^n to the polynomial A_k*(x-(-1)^k)^k for 0 <= k <= n.at n=30A248976
• Triangle read by rows: T(n,k) = Sum_{i=0..n-1} binomial(n-1, i)*T(n-1-i,k-1) - Sum_{i=1..n-1} binomial(n-1,i)*T(n-1-i,k) for 1 <= k <= n+1 with T(0,1) = 1 (and T(n,k) = 0 otherwise).at n=49A341287
• a(n) = Sum_{k=1..n} floor(n/k) * (-n)^(k-1).at n=5A344820