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A074574 as a simple table

n a(n)
0 3
1 20
2 138
3 980
4 7122
5 52700
6 395418
7 2998820
8 22932642
9 176524460
10 1365982698
11 10616089460
12 82804904562
13 647865527420
14 5082373099578
15 39962451176900
16 314860495170882
17 2485193267125580
18 19646626804658058
19 155533156747557140

[3,20,138,980,7122,52700,395418,2998820,22932642,
 176524460,1365982698,10616089460,82804904562,
 647865527420,5082373099578,39962451176900,
 314860495170882,2485193267125580,
 19646626804658058,155533156747557140]

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Last modified March 31 17:36 EDT 2020. Contains 333151 sequences. (Running on oeis4.)