A002248 - OEIS

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A002248 as a simple table

n	a(n)
1	2
2	8
3	14
4	16
5	22
6	56
7	142
8	288
9	518
10	968
11	1982
12	4144
13	8374
14	16472
15	32494
16	65088
17	131174
18	263144
19	525086
20	1047376
21	2094358
22	4193912
23	8393806
24	16783200
25	33550022
26	67092488
27	134210174
28	268460656
29	536911222

[2,8,14,16,22,56,142,288,518,968,1982,4144,8374, 16472,32494,65088,131174,263144,525086,1047376, 2094358,4193912,8393806,16783200,33550022, 67092488,134210174,268460656,536911222]