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

A081007

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

Terms

    a(0) =0a(1) =4a(2) =33a(3) =232a(4) =1596a(5) =10945a(6) =75024a(7) =514228a(8) =3524577a(9) =24157816a(10) =165580140a(11) =1134903169a(12) =7778742048a(13) =53316291172a(14) =365435296161

External references