A032290 - OEIS

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A032290 as a simple table

n	a(n)
1	2
2	2
3	5
4	13
5	38
6	115
7	377
8	1267
9	4446
10	15970
11	58741
12	219765
13	834779
14	3208732
15	12461304
16	48809233
17	192596729
18	764814458
19	3054101548
20	12255774481
21	49396159564
22	199867069373
23	811554088996
24	3305812070784

[2,2,5,13,38,115,377,1267,4446,15970,58741,219765, 834779,3208732,12461304,48809233,192596729, 764814458,3054101548,12255774481,49396159564, 199867069373,811554088996,3305812070784]