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A178685 as a simple table

n a(n)
0 1
1 1
2 3
3 17
4 143
5 1569
6 20911
7 324673
8 5720319
9 112365569
10 2430174335
11 57327084033
12 1464259637503
13 40255921184257
14 1185312426797823
15 37219582236845057
16 1241715255479353343
17 43867539372405948417
18 1636223622007966705663
19 64261630682976366944257

[1,1,3,17,143,1569,20911,324673,5720319,112365569,
 2430174335,57327084033,1464259637503,
 40255921184257,1185312426797823,37219582236845057,
 1241715255479353343,43867539372405948417,
 1636223622007966705663,64261630682976366944257]

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Last modified February 22 18:04 EST 2019. Contains 320400 sequences. (Running on oeis4.)