Number of set partitions of [n] such that at least one pair of consecutive blocks (b,b+1) exists having not exactly one pair of consecutive numbers (i,i+1) with i member of b and i+1 member of b+1.
A272065
Number of set partitions of [n] such that at least one pair of consecutive blocks (b,b+1) exists having not exactly one pair of consecutive numbers (i,i+1) with i member of b and i+1 member of b+1.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =17a(6) =101a(7) =545a(8) =2935a(9) =16351a(10) =95335a(11) =583373a(12) =3745903a(13) =25208633a(14) =177505205a(15) =1305468285a(16) =10009943248a(17) =79880835800a(18) =662319435622
External references
- oeis: A272065