1805056

Appears in sequences

• Triangle of tangent numbers.at n=31A008308
• Triangle T(n,k) (1 <= k <= n) of tangent numbers, read by rows: T(n,k) = coefficient of x^n/n! in expansion of (tan x)^k/k!.at n=57A059419
• A diagonal of A059419.at n=4A059420
• Triangle of tanh numbers.at n=69A111593