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

A180382

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

Terms

    a(0) =5a(1) =17a(2) =94a(3) =188a(4) =1229a(5) =585a(6) =2997a(7) =3247a(8) =3863a(9) =1050a(10) =8888a(11) =4394a(12) =20766a(13) =5504a(14) =1702a(15) =1672a(16) =15071a(17) =4805a(18) =36513a(19) =21449a(20) =13170a(21) =3054a(22) =26623a(23) =14500a(24) =13753a(25) =2927a(26) =3063a(27) =2868a(28) =25908a(29) =17044

External references