681863474058domain: NAppears in sequencesThe partition function G(n,9).at n=18A229226Number of set partitions of {1,...,2n} into sets of size at most n.at n=9A229228Number of partitions of an n-set into blocks of size <= n/2.at n=18A368503Number of separable type set partitions of {1..n}.at n=18A386633