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A018930 as a simple table

n a(n)
1 3
2 4
3 12
4 84
5 132
6 12324
7 1836
8 105552
9 255084
10 197580
11 10358340
12 13775220
13 1936434780
14 51299286012
15 123205977516
16 862441842612
17 1310543298204
18 667510076211780
19 207181940072172
20 110912831751840
21 1698410314006284

[3,4,12,84,132,12324,1836,105552,255084,197580,
 10358340,13775220,1936434780,51299286012,
 123205977516,862441842612,1310543298204,
 667510076211780,207181940072172,110912831751840,
 1698410314006284]

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Last modified November 29 18:13 EST 2022. Contains 358431 sequences. (Running on oeis4.)