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A061558 as a simple table

n a(n)
1 0
2 1
3 2
4 6
5 6
6 30
7 150
8 1210230
9 32671170
10 224494620
11 1536160080
12 1482708889200
13 9918821194590
14 266029822978920
15 266029822978920
16 11358256064006271420
17 341976204789992332560
18 128642760444772214170530
19 2166703103992332274919550

[0,1,2,6,6,30,150,1210230,32671170,224494620,
 1536160080,1482708889200,9918821194590,
 266029822978920,266029822978920,
 11358256064006271420,341976204789992332560,
 128642760444772214170530,
 2166703103992332274919550]

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Last modified December 18 23:46 EST 2018. Contains 318245 sequences. (Running on oeis4.)