Number of ways to partition n labeled elements into pie slices of different sizes of at least 2, allowing the pie to be turned over.

A032221

Number of ways to partition n labeled elements into pie slices of different sizes of at least 2, allowing the pie to be turned over.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =1a(4) =1a(5) =11a(6) =16a(7) =57a(8) =85a(9) =1507a(10) =2896a(11) =12563a(12) =51074a(13) =138789a(14) =7999447a(15) =20571904a(16) =108097917a(17) =509724227a(18) =3208109968a(19) =10079065623

External references