Euler transform of powers of 7.

Terms

a(0) =1a(1) =7a(2) =77a(3) =770a(4) =7609a(5) =73178a(6) =691971a(7) =6438797a(8) =59131499a(9) =536802112a(10) =4824305213a(11) =42970458839a(12) =379692684987