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A102556 as a simple table

n a(n)
1 3
2 15
3 159
4 867
5 19239
6 107985
7 1222563
8 6965835
9 319153335
10 1835486085
11 21185534577
12 122622340677
13 2846090375067
14 16550504577861
15 192854402926251
16 1125503935556763
17 105252693980913879
18 615999836125850637
19 7219077361263238917
20 42347454581722163361
21 994637701798929524937

[3,15,159,867,19239,107985,1222563,6965835,
 319153335,1835486085,21185534577,122622340677,
 2846090375067,16550504577861,192854402926251,
 1125503935556763,105252693980913879,
 615999836125850637,7219077361263238917,
 42347454581722163361,994637701798929524937]

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Last modified June 12 21:39 EDT 2021. Contains 344968 sequences. (Running on oeis4.)