Triangle T(r,n) read by rows: number of n X n (0,1)-matrices with exactly r entries equal to 1 and no zero row or columns.
A104601
Triangle T(r,n) read by rows: number of n X n (0,1)-matrices with exactly r entries equal to 1 and no zero row or columns.
Terms
- a(0) =1a(1) =0a(2) =2a(3) =0a(4) =4a(5) =6a(6) =0a(7) =1a(8) =45a(9) =24a(10) =0a(11) =0a(12) =90a(13) =432a(14) =120a(15) =0a(16) =0a(17) =78a(18) =2248a(19) =4200a(20) =720a(21) =0a(22) =0a(23) =36a(24) =5776a(25) =43000a(26) =43200a(27) =5040a(28) =0a(29) =0
External references
- oeis: A104601