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A018992 as a simple table

n a(n)
2 2
3 4
4 39
5 208
6 981
7 5909
8 37421
9 241885
10 1610770
11 10829938
12 73483649
13 503899769
14 3486438851
15 24325367528
16 171075635301 

[2,4,39,208,981,5909,37421,241885,1610770,
 10829938,73483649,503899769,3486438851,
 24325367528,171075635301]

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Last modified April 23 02:23 EDT 2024. Contains 371906 sequences. (Running on oeis4.)