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A147897 as a simple table

n a(n)
1 1
2 2
3 6
4 16
5 74
6 384
7 1970
8 10998
9 71488
10 465816
11 3856840
12 30115550
13 249292568
14 2424016580
15 22710804768
16 264711365708

[1,2,6,16,74,384,1970,10998,71488,465816,3856840,
 30115550,249292568,2424016580,22710804768,
 264711365708]

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Last modified November 28 04:31 EST 2021. Contains 349400 sequences. (Running on oeis4.)