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A002856 as a simple table

n a(n)
4 1
5 1
6 2
7 8
8 42
9 296
10 2635
11 25626
12 268394
13 2937495
14 33310550
15 388431688
16 4637550072
17 56493493990
18 700335433295

[1,1,2,8,42,296,2635,25626,268394,2937495,
 33310550,388431688,4637550072,56493493990,
 700335433295]

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Last modified November 15 21:36 EST 2019. Contains 329168 sequences. (Running on oeis4.)