956722026040domain: NAppears in sequencesa(n) = Fibonacci(2*n + 1) - 1.at n=29A027941a(n) = Fibonacci(4n+3) - 1, or Fibonacci(2n+2)*Lucas(2n+1).at n=14A081009a(n) = Fibonacci(n)*Lucas(n-1).at n=30A128534Number of vertices of type B at level n of the hyperbolic Pascal pyramid PP_(4,5).at n=31A293064