Bee Ancestors

Bees reproduce in a very different way. The female lay eggs and if the male bee fertilizes the egg then female is born, otherwise male is born. For a male bee at $N=1$, the number of ancestors is $1$ i.e. $1$ female parent. At $N=2$, the number of ancestors for him is $2$ (at $N=1$ there was a female and she will have $2$ parents). Similarly, for a female bee at $N=1$, the number of ancestor