a(n) = -Product_{k=0..n} (10*k - 1); deca-factorial numbers.
A049212
a(n) = -Product_{k=0..n} (10*k - 1); deca-factorial numbers.
Terms
- a(0) =1a(1) =9a(2) =171a(3) =4959a(4) =193401a(5) =9476649a(6) =559122291a(7) =38579438079
External references
- oeis: A049212