T(n,k) is the number of n X n nonnegative integer matrices with row and column i=1..n having sum <= i*k.

A214011

T(n,k) is the number of n X n nonnegative integer matrices with row and column i=1..n having sum <= i*k.

Terms

    a(0) =2a(1) =3a(2) =12a(3) =4a(4) =54a(5) =271a(6) =5a(7) =160a(8) =7722a(9) =24950a(10) =6a(11) =375a(12) =85639a(13) =9318805a(14) =9800058a(15) =7a(16) =756a(17) =564041a(18) =641631566a(19) =98721672541a(20) =16942485560a(21) =8a(22) =1372a(23) =2663506a(24) =17609835599a(28) =9a(29) =2304a(30) =9976732

External references