Partial sums of (1/5)*floor(6^n/7).

Terms

a(0) =0a(1) =0a(2) =1a(3) =7a(4) =44a(5) =266a(6) =1599a(7) =9597a(8) =57586a(9) =345520a(10) =2073125a(11) =12438755a(12) =74632536a(13) =447795222a(14) =2686771339a(15) =16120628041a(16) =96723768254a(17) =580342609532