657972domain: NAppears in sequencesa(n) = binomial(n+2,2) + binomial(n+3,3) + binomial(n+4,4) + binomial(n+5,5).at n=34A027659Number of ordered set partitions of [2n] where the maximal block size equals n.at n=5A276923Number of ordered set partitions of [n] where the maximal block size equals five.at n=5A320761