1217712domain: NAppears in sequencesa(n) = phi(Fibonacci(n)).at n=32A065449Number of 4-indecomposable (connected) graphs on n nodes.at n=38A128526Expansion of x^2*(1+x^2) / ( (x^2-x+1)*(-x^2-x+1)*(1+x+x^2) ).at n=32A227047Indices of hexagonal numbers (A000384) that are also centered pentagonal numbers (A005891).at n=10A254962