Value of Product[k/sd(k,2),k=1..n], where sd(k,b) is the sum of the digits of k represented in base b.
A109489
Value of Product[k/sd(k,2),k=1..n], where sd(k,b) is the sum of the digits of k represented in base b.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =12a(4) =30a(5) =90a(6) =210a(7) =1680a(8) =7560a(9) =37800a(10) =138600a(11) =831600a(12) =3603600a(13) =16816800a(14) =63063000a(15) =1009008000a(16) =8576568000a(17) =77189112000a(18) =488864376000
External references
- oeis: A109489