A014172 - OEIS

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A014172 as a simple table

n	a(n)
0	1
1	3
2	7
3	14
4	27
5	51
6	95
7	179
8	340
9	649
10	1243
11	2407
12	4691
13	9175
14	17982
15	35287
16	69588
17	137596
18	272448
19	539868
20	1070224
21	2122129
22	4217132
23	8389833
24	16700934
25	33255128
26	66228664
27	131908316

[1,3,7,14,27,51,95,179,340,649,1243,2407,4691, 9175,17982,35287,69588,137596,272448,539868, 1070224,2122129,4217132,8389833,16700934,33255128, 66228664,131908316]