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A116456 as a simple table

n a(n)
0 1
1 2
2 8
3 40
4 228
5 1424
6 9520
7 67064
8 492292
9 3735112
10 29114128
11 232077344
12 1885195276
13 15562235264
14 130263211680
15 1103650297320
16 9450760284100
17 81696139565864
18 712188311673280
19 6255662512111248
20 55324571848957688

[1,2,8,40,228,1424,9520,67064,492292,3735112,
 29114128,232077344,1885195276,15562235264,
 130263211680,1103650297320,9450760284100,
 81696139565864,712188311673280,6255662512111248,
 55324571848957688]

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Last modified July 21 06:55 EDT 2019. Contains 325192 sequences. (Running on oeis4.)