a(1) = 1. a(n) = the smallest positive multiple of a(n-1) with exactly n 1's in its binary representation.

A140451

a(1) = 1. a(n) = the smallest positive multiple of a(n-1) with exactly n 1's in its binary representation.

Terms

    a(0) =1a(1) =3a(2) =21a(3) =105a(4) =4305a(5) =21525a(6) =5316675a(7) =3291021825

External references