Numbers of form 9^i*10^j, with i, j >= 0.

Terms

a(0) =1a(1) =9a(2) =10a(3) =81a(4) =90a(5) =100a(6) =729a(7) =810a(8) =900a(9) =1000a(10) =6561a(11) =7290a(12) =8100a(13) =9000a(14) =10000a(15) =59049a(16) =65610a(17) =72900a(18) =81000a(19) =90000a(20) =100000a(21) =531441a(22) =590490a(23) =656100a(24) =729000a(25) =810000a(26) =900000a(27) =1000000a(28) =4782969a(29) =5314410