a(n) = 20*a(n-1) - 64*a(n-2) for n > 1; a(0) = 1, a(1) = 18.

A166927

a(n) = 20*a(n-1) - 64*a(n-2) for n > 1; a(0) = 1, a(1) = 18.

Terms

    a(0) =1a(1) =18a(2) =296a(3) =4768a(4) =76416a(5) =1223168a(6) =19572736a(7) =313171968a(8) =5010784256a(9) =80172679168

External references