Number of set partitions of [2n] having exactly n pairs (m,m+1) such that m+1 is in some block b and m is in block b+1.
A270965
Number of set partitions of [2n] having exactly n pairs (m,m+1) such that m+1 is in some block b and m is in block b+1.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =1a(4) =10a(5) =127a(6) =1650a(7) =23258a(8) =361154a(9) =6131236a(10) =113042841a(11) =2248848796a(12) =47985568177
External references
- oeis: A270965