A079403 - OEIS

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A079403 as a simple table

n	a(n)
2	3
3	6
4	13
5	27
6	54
7	109
8	219
9	439
10	879
11	1759
12	3518
13	7037
14	14075
15	28151
16	56303
17	112606
18	225212
19	450424
20	900848
21	1801696
22	3603393

[3,6,13,27,54,109,219,439,879,1759,3518,7037, 14075,28151,56303,112606,225212,450424,900848, 1801696,3603393]