The number of unlabeled graded posets with n elements.
A361912
The number of unlabeled graded posets with n elements.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =28a(6) =93a(7) =354a(8) =1621a(9) =9110a(10) =64801a(11) =595976a(12) =7204091a(13) =115561423a(14) =2473540433a(15) =70853213144
External references
- oeis: A361912