a(n) = 8*a(n-1) - 6*a(n-2), a(0)=1, a(1)=6.

Terms

a(0) =1a(1) =6a(2) =42a(3) =300a(4) =2148a(5) =15384a(6) =110184a(7) =789168a(8) =5652240a(9) =40482912a(10) =289949856a(11) =2076701376a(12) =14873911872a(13) =106531086720a(14) =763005222528