The number of n-digit positive papaya numbers.

Terms

a(0) =9a(1) =90a(2) =252a(3) =1872a(4) =4464a(5) =29250a(6) =62946a(7) =393912a(8) =809442a(9) =4945140a(10) =9899910a(11) =59366286a(12) =116999892a(13) =692936460a(14) =1349989992a(15) =7919601912a(16) =15299999856a(17) =89099130960a(18) =170999999838a(19) =989995038012