-1421

Appears in sequences

• Triangle T, read by rows, where all columns of T are different and yet all columns of the matrix square T^2 (A118407) are equal; also equals the matrix inverse of triangle A118400.at n=129A118404
• O.g.f. A(x) satisfies: [x^n] exp( n*x*A(x) ) * (n+1 - n*A(x)) = 0 for n >= 1.at n=9A317338
• Triangle read by rows: T(n,k) gives n! times the coefficient of x^k in the polynomial that describes the number of permutations on x letters with major index n.at n=31A342645
• a(n) = n! * Sum_{k=0..n} (-1)^(n-k) * k^4 / k!.at n=7A368717