a(n) = 4*a(n-1) + 13*a(n-2) for n>2, a(1)=1, a(2)=4.

A200069

a(n) = 4*a(n-1) + 13*a(n-2) for n>2, a(1)=1, a(2)=4.

Terms

    a(0) =1a(1) =4a(2) =29a(3) =168a(4) =1049a(5) =6380a(6) =39157a(7) =239568a(8) =1467313a(9) =8983636a(10) =55009613a(11) =336825720a(12) =2062427849a(13) =12628445756a(14) =77325345061a(15) =473471175072

External references