Number of set partitions of [n] such that the difference between each element and its block index is a multiple of seven.
A274840
Number of set partitions of [n] such that the difference between each element and its block index is a multiple of seven.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =2a(9) =3a(10) =4a(11) =5a(12) =6a(13) =7a(14) =8a(15) =17a(16) =34a(17) =65a(18) =120a(19) =215a(20) =374a(21) =629a(22) =1641a(23) =3919a(24) =8849a(25) =19241a(26) =40707a(27) =84203a(28) =170229a(29) =503902
External references
- oeis: A274840