A034758 - OEIS

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A034758 as a simple table

n	a(n)
1	1
2	3
3	5
4	12
5	22
6	70
7	216
8	909
9	4165
10	21207
11	116004
12	678741
13	4213634
14	27644897
15	190899424
16	1382960388
17	10480142200
18	82864878340
19	682076806220
20	5832742247551
21	51724158236078
22	474869816388803
23	4506715738447402

[1,3,5,12,22,70,216,909,4165,21207,116004,678741, 4213634,27644897,190899424,1382960388,10480142200, 82864878340,682076806220,5832742247551, 51724158236078,474869816388803,4506715738447402]