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A074577 as a simple table

n a(n)
0 3
1 21
2 149
3 1071
4 7793
5 57351
6 426449
7 3200631
8 24221633
9 184649031
10 1416683249
11 10930058391
12 84737546273
13 659705518311
14 5154633748049
15 40402118583351
16 317529017187713
17 2501356987117191
18 19744372064060849
19 156123443001239511

[3,21,149,1071,7793,57351,426449,3200631,24221633,
 184649031,1416683249,10930058391,84737546273,
 659705518311,5154633748049,40402118583351,
 317529017187713,2501356987117191,
 19744372064060849,156123443001239511]

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Last modified February 23 16:00 EST 2020. Contains 332171 sequences. (Running on oeis4.)