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A221894 as a simple table

n a(n)
1 3
2 31
3 266
4 2305
5 19936
6 172624
7 1494152
8 12933821
9 111957318
10 969123166
11 8388906524
12 72615905296
13 628576515760
14 5441072941952
15 47098919537873
16 407696835820987
17 3529098152699791
18 30548517126329090
19 264433534642030465

[3,31,266,2305,19936,172624,1494152,12933821,
 111957318,969123166,8388906524,72615905296,
 628576515760,5441072941952,47098919537873,
 407696835820987,3529098152699791,
 30548517126329090,264433534642030465]

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Last modified October 5 20:00 EDT 2022. Contains 357261 sequences. (Running on oeis4.)