Euler transform of powers of 9.

Terms

a(0) =1a(1) =9a(2) =126a(3) =1623a(4) =20583a(5) =254493a(6) =3091803a(7) =36974025a(8) =436377771a(9) =5091463423a(10) =58811218362a(11) =673298882775