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A221769 as a simple table

n a(n)
1 3
2 27
3 240
4 2127
5 18828
6 166581
7 1473549
8 13033908
9 115285587
10 1019699649
11 9019211256
12 79774585647
13 705603080553
14 6241031204616
15 55201672045839
16 488256584905473
17 4318609990477032
18 38197932848425719
19 337859190101460441

[3,27,240,2127,18828,166581,1473549,13033908,
 115285587,1019699649,9019211256,79774585647,
 705603080553,6241031204616,55201672045839,
 488256584905473,4318609990477032,
 38197932848425719,337859190101460441]

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Last modified August 10 00:21 EDT 2022. Contains 356026 sequences. (Running on oeis4.)