10015581680domain: NAppears in sequencesNumber of partitions of n*(n-1)/2.at n=16A066655Partition numbers (A000041) which are multiples of 10 (A008592).at n=20A127544Partition numbers of the form 8k.at n=19A225358Partition numbers (A000041) of the form 2^4 * k for odd k.at n=4A278198