Number of set partitions of [n] having exactly four pairs (m,m+1) such that m+1 is in some block b and m is in block b+1.
A270958
Number of set partitions of [n] having exactly four pairs (m,m+1) such that m+1 is in some block b and m is in block b+1.
Terms
- a(0) =10a(1) =174a(2) =1783a(3) =15158a(4) =121464a(5) =965616a(6) =7776877a(7) =64017975a(8) =540759958a(9) =4695640591a(10) =41947390960a(11) =385584558062
External references
- oeis: A270958