Sum of the sizes of the blocks containing the element 1 in all set partitions of {1,2,...,n}.
A124427
Sum of the sizes of the blocks containing the element 1 in all set partitions of {1,2,...,n}.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =9a(4) =30a(5) =112a(6) =463a(7) =2095a(8) =10279a(9) =54267a(10) =306298a(11) =1838320a(12) =11677867a(13) =78207601a(14) =550277003a(15) =4055549053a(16) =31224520322a(17) =250547144156
External references
- oeis: A124427