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A115220 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 1
5 2
6 6
7 24
8 95
9 380
10 1520
11 6072
12 24253
13 96870
14 386910
15 1545368
16 6172403
17 24653392
18 98468904
19 393297808
20 1570883385
21 6274315690
22 25060445446
23 100094728568
24 399791564311
25 1596820303940
26 6377911168464
27 25474219467560
28 101747396653957
29 406392538897646

[0,0,0,0,1,2,6,24,95,380,1520,6072,24253,96870,
 386910,1545368,6172403,24653392,98468904,
 393297808,1570883385,6274315690,25060445446,
 100094728568,399791564311,1596820303940,
 6377911168464,25474219467560,101747396653957,
 406392538897646]

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Last modified May 22 21:50 EDT 2019. Contains 323504 sequences. (Running on oeis4.)