Triangle T(n,k) read by rows: number of k X k triangular matrices with nonnegative integer entries and without zero rows or columns such that sum of all entries is equal to n, n>=1, 1<=k<=n.
A137251
Triangle T(n,k) read by rows: number of k X k triangular matrices with nonnegative integer entries and without zero rows or columns such that sum of all entries is equal to n, n>=1, 1<=k<=n.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =6a(8) =7a(9) =1a(10) =1a(11) =10a(12) =26a(13) =15a(14) =1a(15) =1a(16) =15a(17) =71a(18) =98a(19) =31a(20) =1a(21) =1a(22) =21a(23) =161a(24) =425a(25) =342a(26) =63a(27) =1a(28) =1a(29) =28
External references
- oeis: A137251