Sum of the sizes of the third blocks in all set partitions of {1,2,...,n}.
A270495
Sum of the sizes of the third blocks in all set partitions of {1,2,...,n}.
Terms
- a(0) =1a(1) =8a(2) =47a(3) =253a(4) =1345a(5) =7304a(6) =41193a(7) =243152a(8) =1506521a(9) =9799547a(10) =66844755a(11) =477297022a(12) =3560469469a(13) =27692022408a(14) =224128400923
External references
- oeis: A270495