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A026901 as a simple table

n a(n)
3 1
4 10
5 68
6 396
7 2136
8 11062
9 56070
10 281306
11 1406721
12 7042818
13 35401568
14 178975192
15 910933936
16 4669860386
17 24114746282
18 125416122430
19 656713729000
20 3460748531510
21 18345703137458
22 97782896293158
23 523786141723670

[1,10,68,396,2136,11062,56070,281306,1406721,
 7042818,35401568,178975192,910933936,4669860386,
 24114746282,125416122430,656713729000,
 3460748531510,18345703137458,97782896293158,
 523786141723670]

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Last modified February 9 06:46 EST 2023. Contains 360153 sequences. (Running on oeis4.)