a(n+1) = 4*a(n) + 11*a(n-1) - 2*a(n-2).

Terms

a(0) =1a(1) =13a(2) =61a(3) =385a(4) =2185a(5) =12853a(6) =74677a(7) =435721a(8) =2538625a(9) =14798077a(10) =86245741a(11) =502684561a(12) =2929845241a(13) =17076419653a(14) =99528607141a(15) =580095354265