A088938 - OEIS

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A088938 as a simple table

n	a(n)
1	2
2	3
3	5
4	10
5	27
6	104
7	541
8	3498
9	26615
10	231172
11	2250129
12	24227486
13	285705643
14	3660694200
15	50624828357
16	751426146514
17	11913622408671
18	200919532718828
19	3591112295892985
20	67803855263483142
21	1348467602319393299

[2,3,5,10,27,104,541,3498,26615,231172,2250129, 24227486,285705643,3660694200,50624828357, 751426146514,11913622408671,200919532718828, 3591112295892985,67803855263483142, 1348467602319393299]