a(n) = F(4n) - 2n, where F(n) = Fibonacci numbers A000045.

A099922

a(n) = F(4n) - 2n, where F(n) = Fibonacci numbers A000045.

Terms

    a(0) =1a(1) =17a(2) =138a(3) =979a(4) =6755a(5) =46356a(6) =317797a(7) =2178293a(8) =14930334a(9) =102334135a(10) =701408711a(11) =4807526952a(12) =32951280073a(13) =225851433689

External references