Number of set partitions of [n] having exactly one pair (m,m+1) such that m+1 is in some block b and m is in block b+1.
A270955
Number of set partitions of [n] having exactly one pair (m,m+1) such that m+1 is in some block b and m is in block b+1.
Terms
- a(0) =1a(1) =6a(2) =24a(3) =91a(4) =374a(5) =1699a(6) =8410a(7) =44794a(8) =254718a(9) =1538027a(10) =9818858a(11) =66030017a(12) =466215802a(13) =3446197857a(14) =26600048069a(15) =213901723087
External references
- oeis: A270955