Hello! I need to generate a sequence in Excel and would appreciate your help. In Column A, we have generations from 1,2,3.... and in Column B, we have the number of rabbit pairs increasing at each generation. Initial conditions cause some wobble/chaos at the beginning of the sequence. Beginning at G(8), the sequence's pattern begins. The formula for it is X_n = X_n-1 + X_n-4.

Generation	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17
# of Rabbit Pairs	1	1	1	1	2	3	4	5	7	10	14	19	26	36	50	69	?

I need to know at what generation the rabbit population reaches 100,000. Also, if you could tell me how to enter a formula like this into Excel for future problems, it would be most appreciated. Thank you very much!