Number of set partitions of [2n] having exactly n pairs (m,m+1) such that m is in some block b and m+1 is in block b+1.
A271841
Number of set partitions of [2n] having exactly n pairs (m,m+1) such that m is in some block b and m+1 is in block b+1.
Terms
- a(0) =1a(1) =1a(2) =6a(3) =61a(4) =891a(5) =17081a(6) =404275a(7) =11364373a(8) =368982178a(9) =13564841773a(10) =556179920807
External references
- oeis: A271841