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Coding Problem: Series Based

Coding question based on series are usually asked in coding section of various coding tests.
 

Find the nth term of the series:

0,0,7,6,14,12,21,18, 28_ _ _ _

Find the nth term of the series: 

1 , 1 , 2 , 3 , 4 , 9 , 8 , 27 , 16 , 81 , 32 , 243 ,_ _ _ _ 

Find the nth term of the series: 

0, 0, 2, 1, 4, 2, 6, 3, 8, 4, 10, 5, 12, 6, 14, 7, 16, 8


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