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

A081003

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

Terms

    a(0) =2a(1) =6a(2) =35a(3) =234a(4) =1598a(5) =10947a(6) =75026a(7) =514230a(8) =3524579a(9) =24157818a(10) =165580142a(11) =1134903171a(12) =7778742050a(13) =53316291174a(14) =365435296163

External references