If a(n) is a k-digit number, a(n+1) is the product of the number formed by the initial k-1 digits of a(n) and the final digit of a(n). If k=1, set a(n+1) = 0.

A115753

If a(n) is a k-digit number, a(n+1) is the product of the number formed by the initial k-1 digits of a(n) and the final digit of a(n). If k=1, set a(n+1) = 0.