90177535

Appears in sequences

• Björner-Welker sequence: 2^n*(n^2 + n + 2) - 1.at n=18A055580
• Square array read by antidiagonals: T(n,k) = Sum_{j = 0..n*k} binomial(n+j-1,j)*2^j; n,k >= 0.at n=51A333560