a(n) is the number of ordered partitions of {1, 1, 1, 2, 3, ..., n-2}.
A172110
a(n) is the number of ordered partitions of {1, 1, 1, 2, 3, ..., n-2}.
Terms
- a(0) =0a(1) =0a(2) =4a(3) =20a(4) =132a(5) =1076a(6) =10404a(7) =116180a(8) =1469892a(9) =20766836a(10) =323924964a(11) =5527326740a(12) =102396386052
External references
- oeis: A172110