A028831 - OEIS

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A028831 as a simple table

n	a(n)
0	1
1	3
2	7
3	11
4	22
5	43
6	83
7	159
8	307
9	592
10	1141
11	2199
12	4239
13	8171
14	15750
15	30359
16	58519
17	112799
18	217427
19	419104
20	807849
21	1557179
22	3001559
23	5785691
24	11152278
25	21496707
26	41436235
27	79870911
28	153956131

[1,3,7,11,22,43,83,159,307,592,1141,2199,4239, 8171,15750,30359,58519,112799,217427,419104, 807849,1557179,3001559,5785691,11152278,21496707, 41436235,79870911,153956131]