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A207556 as a simple table

n a(n)
0 1
1 1
2 3
3 11
4 55
5 339
6 2499
7 21433
8 209717
9 2305719
10 28141925
11 377579731
12 5523750291
13 87508680045
14 1492510215135
15 27266981038343
16 531245913925837
17 10995334516297279
18 240925208376757203
19 5571653169126500083
20 135617881389268715939
21 3465772763274106884733

[1,1,3,11,55,339,2499,21433,209717,2305719,
 28141925,377579731,5523750291,87508680045,
 1492510215135,27266981038343,531245913925837,
 10995334516297279,240925208376757203,
 5571653169126500083,135617881389268715939,
 3465772763274106884733]

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Last modified November 30 02:42 EST 2020. Contains 338781 sequences. (Running on oeis4.)