Triangle read by rows: T(n,k) is the number of non-equivalent subsets of size k in S_n, 0 <= k <= n!.
A381842
Triangle read by rows: T(n,k) is the number of non-equivalent subsets of size k in S_n, 0 <= k <= n!.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =2a(10) =2a(11) =2a(12) =1a(13) =1a(14) =1a(15) =1a(16) =4a(17) =10a(18) =41a(19) =103a(20) =309a(21) =691a(22) =1458a(23) =2448a(24) =3703a(25) =4587a(26) =5050a(27) =4587a(28) =3703a(29) =2448
External references
- oeis: A381842