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A221899 as a simple table

n a(n)
1 3
2 31
3 258
4 2241
5 19408
6 167960
7 1453952
8 12585637
9 108943526
10 943035150
11 8163084148
12 70661144632
13 611655753520
14 5294603734144
15 45831055372945
16 396721972412987
17 3434097733826959
18 29726176177614458
19 257315201439500033

[3,31,258,2241,19408,167960,1453952,12585637,
 108943526,943035150,8163084148,70661144632,
 611655753520,5294603734144,45831055372945,
 396721972412987,3434097733826959,
 29726176177614458,257315201439500033]

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Last modified December 1 21:09 EST 2022. Contains 358484 sequences. (Running on oeis4.)