a(n) = Lucas(4n) + 3, or 5*Fibonacci(2n-1)*Fibonacci(2n+1).

A081076

a(n) = Lucas(4n) + 3, or 5*Fibonacci(2n-1)*Fibonacci(2n+1).

Terms

    a(0) =5a(1) =10a(2) =50a(3) =325a(4) =2210a(5) =15130a(6) =103685a(7) =710650a(8) =4870850a(9) =33385285a(10) =228826130a(11) =1568397610a(12) =10749957125a(13) =73681302250a(14) =505019158610

External references