a(1) = 17, a(2) = 80, a(n) = 4*(a(n-1) + a(n-2)) for n >= 3.

A228602

a(1) = 17, a(2) = 80, a(n) = 4*(a(n-1) + a(n-2)) for n >= 3.

Terms

    a(0) =17a(1) =80a(2) =388a(3) =1872a(4) =9040a(5) =43648a(6) =210752a(7) =1017600a(8) =4913408a(9) =23724032a(10) =114549760a(11) =553095168a(12) =2670579712a(13) =12894699520a(14) =62261116928a(15) =300623265792

External references