a(n) = 7*a(n-1)-n for n> 0, a(0)=1.

Terms

a(0) =1a(1) =6a(2) =40a(3) =277a(4) =1935a(5) =13540a(6) =94774a(7) =663411a(8) =4643869a(9) =32507074a(10) =227549508a(11) =1592846545a(12) =11149925803a(13) =78049480608a(14) =546346364242