Number of set partitions of {1, ..., n} with no singletons or cyclical adjacencies (successive elements in the same block, where 1 is a successor of n).
A324011
Number of set partitions of {1, ..., n} with no singletons or cyclical adjacencies (successive elements in the same block, where 1 is a successor of n).
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =0a(6) =5a(7) =14a(8) =66a(9) =307a(10) =1554a(11) =8415a(12) =48530a(13) =296582a(14) =1913561a(15) =12988776a(16) =92467629a(17) =688528288a(18) =5349409512a(19) =43270425827a(20) =363680219762
External references
- oeis: A324011