Triangular array: T(n,k) counts upper triangular matrices with entries from {0,1} having n 1's in total, with k 1's on the main diagonal and at least one nonzero entry in each row.
A182319
Triangular array: T(n,k) counts upper triangular matrices with entries from {0,1} having n 1's in total, with k 1's on the main diagonal and at least one nonzero entry in each row.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =1a(6) =7a(7) =16a(8) =9a(9) =1a(10) =33a(11) =83a(12) =64a(13) =16a(14) =1a(15) =197a(16) =530a(17) =486a(18) =180a(19) =25a(20) =1a(21) =1419a(22) =4026a(23) =4144a(24) =1930a(25) =410a(26) =36a(27) =1a(28) =11966a(29) =35462
External references
- oeis: A182319