Value of Product_{k=1..n} sigma(k)/sd(k,2), where sd(k,b) is the sum of the digits of k represented in base b.
A109491
Value of Product_{k=1..n} sigma(k)/sd(k,2), where sd(k,b) is the sum of the digits of k represented in base b.
Terms
- a(0) =1a(1) =3a(2) =6a(3) =42a(4) =126a(5) =756a(6) =2016a(7) =30240a(8) =196560a(9) =1769040a(10) =7076160a(11) =99066240a(12) =462309120a(13) =3698472960a(14) =22190837760a(15) =687915970560
External references
- oeis: A109491