2571177913domain: NAppears in sequencesNumber of set partitions of [n] with symmetric block size list of length nine.at n=10A275292Number of set partitions of [n] with symmetric block size list of length A004525(n).at n=19A305197Number of set partitions of [2n+1] with symmetric block size list of length A109613(n).at n=9A305198