a(n) = count of numbers formed using the digits of next n numbers.

A081992

a(n) = count of numbers formed using the digits of next n numbers.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =96a(4) =5040a(5) =1829520a(6) =2162160a(7) =243243000a(8) =49989139200

External references