Number of ways to select a subset s containing n from {1,...,n} and then partition s into blocks of equal size.
A262321
Number of ways to select a subset s containing n from {1,...,n} and then partition s into blocks of equal size.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =18a(5) =43a(6) =118a(7) =337a(8) =1025a(9) =3479a(10) =13056a(11) =48817a(12) =199477a(13) =898135a(14) =4051128a(15) =18652459a(16) =93872040a(17) =492132207a(18) =2658676056a(19) =14841915049a(20) =84757413959a(21) =517609038551
External references
- oeis: A262321