Number of set partitions of [n] such that the difference between each element and its block index is a multiple of six.
A274839
Number of set partitions of [n] such that the difference between each element and its block index is a multiple of six.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =3a(9) =4a(10) =5a(11) =6a(12) =7a(13) =15a(14) =30a(15) =57a(16) =104a(17) =183a(18) =310a(19) =811a(20) =1939a(21) =4377a(22) =9497a(23) =19987a(24) =40883a(25) =121620a(26) =339817a(27) =902822a(28) =2301883a(29) =5665060
External references
- oeis: A274839