Partial sums of floor(7^n/8)/6.

Terms

a(0) =0a(1) =1a(2) =8a(3) =58a(4) =408a(5) =2859a(6) =20016a(7) =140116a(8) =980816a(9) =6865717a(10) =48060024a(11) =336420174a(12) =2354941224a(13) =16484588575a(14) =115392120032a(15) =807744840232