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A004987 as a simple table

n a(n)
0 1
1 3
2 18
3 126
4 945
5 7371
6 58968
7 480168
8 3961386
9 33011550
10 277297020
11 2344420260
12 19927572210
13 170150808870
14 1458435504600
15 12542545339560
16 108179453553705
17 935434098376155
18 8107095519260010
19 70403724246205350
20 612512400941986545
21 5337608065351597035
22 46582761297613937760

[1,3,18,126,945,7371,58968,480168,3961386,
 33011550,277297020,2344420260,19927572210,
 170150808870,1458435504600,12542545339560,
 108179453553705,935434098376155,8107095519260010,
 70403724246205350,612512400941986545,
 5337608065351597035,46582761297613937760]

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Last modified March 28 14:21 EDT 2024. Contains 371254 sequences. (Running on oeis4.)