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My sequence starts at 4. Double 4 to get 8. 8 minus 3 to get 5. Double 5 to get 10. 10 minus 3 to get 7 double 7 to get 14 and so forth. 4, 8, 5, 10, 7, 14, 11, 22, 19, 38........ It can be simplified for my specific needs, as I only care about every other number, starting with 8. 8, 10...