1134903168domain: NAppears in sequencesa(n) = Fibonacci(4n+1) - 2, or Fibonacci(2n+2)*Lucas(2n-1).at n=10A081012Continued fraction expansion of product_{n>=0} (1-sqrt(5)*[sqrt(5)-2]^{4n+3})/(1-sqrt(5)*[sqrt(5)-2]^{4n+1}).at n=27A221076Number of compositions of n into parts 1 and 2 with both parts present.at n=41A245738