376093

Appears in sequences

• Expansion of E.g.f. exp(-x)/(1-3x).at n=6A000180
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of the e.g.f. exp(-x)/(1 - k*x).at n=51A320032
• Triangle read by rows: T(n, k) = n! * 3^k * hypergeom([-k], [-n], -1/3).at n=27A375446