A090165 - OEIS

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A090165 as a simple table

n	a(n)
0	1
1	3
2	6
3	14
4	32
5	66
6	134
7	280
8	585
9	1214
10	2462
11	4946
12	9861
13	19600
14	38688
15	76086
16	148435
17	288098
18	554970
19	1062628
20	2016814
21	3800682
22	7093209
23	13127364
24	24053454
25	43657576
26	78382622
27	139237375

[1,3,6,14,32,66,134,280,585,1214,2462,4946,9861, 19600,38688,76086,148435,288098,554970,1062628, 2016814,3800682,7093209,13127364,24053454, 43657576,78382622,139237375]