Total sum of the sizes of all blocks with maximal element 2 in all set partitions of {1,2,...,n}.
A270756
Total sum of the sizes of all blocks with maximal element 2 in all set partitions of {1,2,...,n}.
Terms
- a(0) =3a(1) =4a(2) =9a(3) =25a(4) =82a(5) =307a(6) =1283a(7) =5894a(8) =29427a(9) =158269a(10) =910520a(11) =5570737a(12) =36071631a(13) =246188196a(14) =1764757189a(15) =13246059237a(16) =103825154098a(17) =847806545767
External references
- oeis: A270756