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A018987 as a simple table

n a(n)
2 2
3 8
4 52
5 216
6 1184
7 6715
8 38070
9 236911
10 1513556
11 10014921
12 68149007
13 471361443
14 3294708504
15 23177870025
16 163776870956

[2,8,52,216,1184,6715,38070,236911,1513556,
 10014921,68149007,471361443,3294708504,
 23177870025,163776870956]

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Last modified February 29 05:25 EST 2020. Contains 332353 sequences. (Running on oeis4.)