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A000988 as a simple table

n a(n)
1 1
2 1
3 2
4 7
5 18
6 60
7 196
8 704
9 2500
10 9189
11 33896
12 126759
13 476270
14 1802312
15 6849777
16 26152418
17 100203194
18 385221143
19 1485200848
20 5741256764
21 22245940545
22 86383382827
23 336093325058
24 1309998125640
25 5114451441106
26 19998172734786
27 78306011677182
28 307022182222506
29 1205243866707468
30 4736694001644862

[1,1,2,7,18,60,196,704,2500,9189,33896,126759,
 476270,1802312,6849777,26152418,100203194,
 385221143,1485200848,5741256764,22245940545,
 86383382827,336093325058,1309998125640,
 5114451441106,19998172734786,78306011677182,
 307022182222506,1205243866707468,4736694001644862]

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Last modified February 16 14:47 EST 2019. Contains 320163 sequences. (Running on oeis4.)