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If 1+2=3 3+4=21 5+6=55 then 4+5=? the answer i found is 36.is there any other answer for this?

1 +2 = 3 ;   3 *  1 = 3
3 + 4 = 7 ;   7 * 3 = 21
5 + 6 = 11;  11* 5 = 55
7 + 8 = 15 ;  15 *7 =105
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....................................  This is the given pattern.


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