T(n,k)=number of increasing sequences of n integers x(1),...,x(n) with values in 1..k*n such that x(j) divides x(k) if j divides k.

A180383

T(n,k)=number of increasing sequences of n integers x(1),...,x(n) with values in 1..k*n such that x(j) divides x(k) if j divides k.

Terms

    a(0) =1a(1) =2a(2) =1a(3) =3a(4) =4a(5) =1a(6) =4a(7) =8a(8) =11a(9) =1a(10) =5a(11) =12a(12) =32a(13) =15a(14) =1a(15) =6a(16) =17a(17) =69a(18) =66a(19) =48a(20) =1a(21) =7a(22) =23a(23) =114a(24) =143a(25) =310a(26) =48a(27) =1a(28) =8a(29) =27

External references