27941760

Appears in sequences

• Expansion of e.g.f.: x^4*(log(1-x))^2.at n=11A052799
• Number of degree-n permutations of order exactly 30.at n=11A061128
• Fourth (unsigned) column sequence of triangle A062139 (generalized a=2 Laguerre).at n=6A062193
• a(n) = Product_{k=1..n} (F(k)+1) where F(k) denotes the k-th Fibonacci number.at n=9A082480
• Triangle read by rows: number of nilpotent partial transformations (of an n-element set) of height r (height(alpha) = |Im(alpha)|), 0 <= r < n.at n=42A141618
• Coefficient triangle of polynomials recursively defined by P(n,x) = (n+1)*(n+1)! + x*Sum_{k=1..n} k^2*n!/(n+1-k)!*P(n-k,x) with P(0,x) = 1.at n=42A322970
• a(n) = Sum_{k=0..floor(n/3)} 2^k * 3^(n-3*k) * binomial(k+6,6) * binomial(2*k,2*(n-3*k)).at n=17A391723