Number of sets (forests) of labeled identity trees (trees enumerated by A228159) with n nodes.
A228160
Number of sets (forests) of labeled identity trees (trees enumerated by A228159) with n nodes.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =13a(4) =97a(5) =861a(6) =10171a(7) =144313a(8) =2425473a(9) =46361017a(10) =1008845011a(11) =24440301381a(12) =653993215393
External references
- oeis: A228160