52926domain: NAppears in sequencesNumber of ordered 2-multiantichains on an n-set.at n=8A092880Expansion of Product_{k>=1} (1-x^k)*(1+x^k)^4.at n=31A261998Centered pentagonal numbers which are products of three distinct primes.at n=22A364610Centered pentagonal numbers that are abundant.at n=25A382696