a(n) = (F(8*n+1) - 1)/3 where F=A000045 (the Fibonacci sequence).

A049654

a(n) = (F(8*n+1) - 1)/3 where F=A000045 (the Fibonacci sequence).

Terms

    a(0) =0a(1) =11a(2) =532a(3) =25008a(4) =1174859a(5) =55193380a(6) =2592914016a(7) =121811765387

External references