a(n) = Product_{k=1..n} (9*k - 1); 9-factorial numbers.
A049211
a(n) = Product_{k=1..n} (9*k - 1); 9-factorial numbers.
Terms
- a(0) =1a(1) =8a(2) =136a(3) =3536a(4) =123760a(5) =5445440a(6) =288608320a(7) =17893715840
External references
- oeis: A049211