a(n) = Fibonacci(4n+2) + 1, or Fibonacci(2n+2)*Lucas(2n).

A081004

a(n) = Fibonacci(4n+2) + 1, or Fibonacci(2n+2)*Lucas(2n).

Terms

    a(0) =2a(1) =9a(2) =56a(3) =378a(4) =2585a(5) =17712a(6) =121394a(7) =832041a(8) =5702888a(9) =39088170a(10) =267914297a(11) =1836311904a(12) =12586269026a(13) =86267571273a(14) =591286729880

External references