Number of increasing sequences of n integers x(1),...,x(n) with values in 1..5*n such that x(j) divides x(k) if j divides k.

A180387

Number of increasing sequences of n integers x(1),...,x(n) with values in 1..5*n such that x(j) divides x(k) if j divides k.

Terms

    a(0) =5a(1) =17a(2) =114a(3) =268a(4) =2585a(5) =2453a(6) =23133a(7) =30560a(8) =70724a(9) =40977a(10) =467997a(11) =405973a(12) =3131191a(13) =1558883a(14) =1193291a(15) =776623a(16) =6785939a(17) =3324572a(18) =30242480a(19) =24540171a(20) =14057479a(21) =5026100a(22) =56576114a(23) =48073174a(24) =71932365a(25) =24822503a(26) =33429019a(27) =21882049a(28) =163121157

External references