43837

Appears in sequences

• G.f.: 1/(1-x-x^2-2*x^3-5*x^4).at n=14A212340
• Partial sums of products of proper divisors of n (A007956).at n=34A339308
• a(0) = 1; a(n) = Sum_{k=0..n-1} (-1)^k * (k+1) * a(k) * a(n-k-1).at n=8A376134