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A018984 as a simple table

n a(n)
2 1
3 9
4 48
5 180
6 1322
7 6853
8 43804
9 283623
10 1885015
11 13026464
12 90977470
13 644191249
14 4594696120
15 32969721835
16 237966662872

[1,9,48,180,1322,6853,43804,283623,1885015,
 13026464,90977470,644191249,4594696120,
 32969721835,237966662872]

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Last modified January 24 10:33 EST 2020. Contains 331193 sequences. (Running on oeis4.)