Number of partitions of n-set with distinct block sizes.

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =5a(5) =16a(6) =82a(7) =169a(8) =541a(9) =2272a(10) =17966a(11) =44419a(12) =201830a(13) =802751a(14) =4897453a(15) =52275409a(16) =166257661a(17) =840363296a(18) =4321172134a(19) =24358246735a(20) =183351656650