Number of set partitions of [n] such that the difference between each element and its block index is a multiple of five.
A274838
Number of set partitions of [n] such that the difference between each element and its block index is a multiple of five.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =3a(8) =4a(9) =5a(10) =6a(11) =13a(12) =26a(13) =49a(14) =88a(15) =151a(16) =397a(17) =951a(18) =2145a(19) =4633a(20) =9643a(21) =28898a(22) =80843a(23) =214126a(24) =542081a(25) =1317924a(26) =4392295a(27) =13871122a(28) =41984457a(29) =122463762
External references
- oeis: A274838