F(45) = 4*45 + F(43)
F(45) = 4*45 + 4*43 + F(41)
...
F(45) = 4*(45 + 43 + 41 + 39 + 37 + 35 + 33 + 31 + 29 + 27 + 25 + 23 + 21 + 19 + 17 + 15+ 13 + 11 + 9 + 7 + 5 + 3) + 1
F(45) = 4*528 + 1
F(45) = 2113
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F(45) = 4*45 + F(43)
F(45) = 4*45 + 4*43 + F(41)
...
F(45) = 4*(45 + 43 + 41 + 39 + 37 + 35 + 33 + 31 + 29 + 27 + 25 + 23 + 21 + 19 + 17 + 15+ 13 + 11 + 9 + 7 + 5 + 3) + 1
F(45) = 4*528 + 1
F(45) = 2113