Total sum of the sizes of all blocks with minimal element 2 in all set partitions of {1,2,...,n}.
A270765
Total sum of the sizes of all blocks with minimal element 2 in all set partitions of {1,2,...,n}.
Terms
- a(0) =1a(1) =4a(2) =16a(3) =67a(4) =299a(5) =1429a(6) =7307a(7) =39848a(8) =230884a(9) =1416047a(10) =9160977a(11) =62316137a(12) =444424965a(13) =3314372728a(14) =25786012724a(15) =208842481687
External references
- oeis: A270765