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A074539 as a simple table

n a(n)
0 3
1 15
2 93
3 645
4 4737
5 35925
6 277833
7 2175405
8 17168097
9 136171365
10 1083508473
11 8638764765
12 68963621457
13 550976525205
14 4404150043113
15 35214889699725
16 281627564666817
17 2252562753269445
18 18018213207009753
19 144134261562708285

[3,15,93,645,4737,35925,277833,2175405,17168097,
 136171365,1083508473,8638764765,68963621457,
 550976525205,4404150043113,35214889699725,
 281627564666817,2252562753269445,
 18018213207009753,144134261562708285]

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Last modified January 25 23:08 EST 2020. Contains 331270 sequences. (Running on oeis4.)