A232017 - OEIS

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A232017 as a simple table

n	a(n)
1	3
2	22
3	121
4	704
5	4059
6	23422
7	135166
8	779977
9	4500958
10	25973244
11	149881402
12	864906711
13	4991036946
14	28801314179
15	166201073269
16	959081123649
17	5534480515641
18	31937313562863
19	184297694197368
20	1063509616098391

[3,22,121,704,4059,23422,135166,779977,4500958, 25973244,149881402,864906711,4991036946, 28801314179,166201073269,959081123649, 5534480515641,31937313562863,184297694197368, 1063509616098391]