-2135

Appears in sequences

• Triangle T, read by rows, that satisfies matrix equation: T + (T-I)^2 = C, where C is Pascal's triangle.at n=31A120903
• Fourth column (m=3) of triangle A128494.at n=54A128498
• Fourth column (m=3) of triangle A128494.at n=55A128498
• Triangle read by rows: T(n, k) = (2*n + 1)! * [y^(2*k)] [x^(2*n+1)] arctan(sec(x*y)*sinh(x)).at n=8A371688