These are squares.
12 = 1
22 = 4
32 = 9
(it is missing 42 = 16)
52 = 25
62 = 36
The next one in the series is probably 72 = 49.
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81
49 (it is an arithmetic series that adds 5 then 7 then 9 then 11 then 13)
The Pattern is 1^2- 2^2- 3^2- 4^2- 5^2 or 1 - 4 - 9 - 16 - 25 The next number in the series is 6^2 or 36
108
36