Number of set partitions of {1,2,...,n} such that the element 1 is in an odd-sized block.
A224271
Number of set partitions of {1,2,...,n} such that the element 1 is in an odd-sized block.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =107a(6) =459a(7) =2151a(8) =10931a(9) =59700a(10) =348146a(11) =2155925a(12) =14112377a(13) =97266301a(14) =703484851a(15) =5323515156a(16) =42040470092a(17) =345670438963
External references
- oeis: A224271