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A018997 as a simple table

n a(n)
2 2
3 7
4 36
5 230
6 1104
7 6657
8 38976
9 247431
10 1617560
11 10806202
12 73706144
13 510591393
14 3568689922
15 25130781435
16 178056349424 

[2,7,36,230,1104,6657,38976,247431,1617560,
 10806202,73706144,510591393,3568689922,
 25130781435,178056349424]

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Last modified September 3 20:21 EDT 2024. Contains 375675 sequences. (Running on oeis4.)