T(n,k) is the number of size k ordered submultisets of the regular multiset {1_1,1_2,...,1_(n-1),1_n, ... ,i_1,i_2,...,i_(n-1),i_n, ... ,n_1,n_2,...,n_(n-1),n_n} (which contains n copies of i for 1 <= i <= n).
A234574
T(n,k) is the number of size k ordered submultisets of the regular multiset {1_1,1_2,...,1_(n-1),1_n, ... ,i_1,i_2,...,i_(n-1),i_n, ... ,n_1,n_2,...,n_(n-1),n_n} (which contains n copies of i for 1 <= i <= n).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =4a(6) =6a(7) =6a(8) =1a(9) =3a(10) =9a(11) =27a(12) =78a(13) =210a(14) =510a(15) =1050a(16) =1680a(17) =1680a(18) =1a(19) =4a(20) =16a(21) =64a(22) =256a(23) =1020a(24) =4020a(25) =15540a(26) =58380a(27) =210840a(28) =722400a(29) =2310000
External references
- oeis: A234574