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A303839 as a simple table

n a(n)
0 1
1 0
2 1
3 1
4 3
5 5
6 17
7 40
8 138
9 430
10 1546
11 5478
12 20525
13 77310
14 298301
15 1161692
16 4583525
17 18239037
18 73221198
19 296046399
20 1205038270
21 4933969005
22 20311807087
23 84029440358
24 349201537324
25 1457205298510
26 6104204225832
27 25661191956781
28 108231773165825

[1,0,1,1,3,5,17,40,138,430,1546,5478,20525,77310,
 298301,1161692,4583525,18239037,73221198,
 296046399,1205038270,4933969005,20311807087,
 84029440358,349201537324,1457205298510,
 6104204225832,25661191956781,108231773165825]

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Last modified June 25 07:53 EDT 2019. Contains 324347 sequences. (Running on oeis4.)