Triangle read by rows where T(n,k), n>=1, 1<=k<=n is the number of (0,1)-matrices of size n with the first row and column sum = k and remaining sums = 1.
A308498
Triangle read by rows where T(n,k), n>=1, 1<=k<=n is the number of (0,1)-matrices of size n with the first row and column sum = k and remaining sums = 1.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =6a(4) =5a(5) =1a(6) =24a(7) =27a(8) =10a(9) =1a(10) =120a(11) =168a(12) =88a(13) =17a(14) =1a(15) =720a(16) =1200a(17) =800a(18) =225a(19) =26a(20) =1a(21) =5040a(22) =9720a(23) =7800a(24) =2850a(25) =486a(26) =37a(27) =1a(28) =40320a(29) =88200
External references
- oeis: A308498