200652domain: NAppears in sequencesNumber of partitions of n where n divides the product of the parts.at n=55A057568Structured truncated icosahedral numbers.at n=22A100154Central coefficient of the triangle A097609.at n=11A212696a(n) = Sum_{k=1..n-1} sigma(k)*sigma_3(n-k).at n=18A374963