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A001998 as a simple table

n a(n)
0 1
1 2
2 4
3 10
4 25
5 70
6 196
7 574
8 1681
9 5002
10 14884
11 44530
12 133225
13 399310
14 1196836
15 3589414
16 10764961
17 32291602
18 96864964
19 290585050
20 871725625
21 2615147350
22 7845353476
23 23535971854
24 70607649841
25 211822683802
26 635467254244
27 1906400965570
28 5719200505225
29 17157599124190

[1,2,4,10,25,70,196,574,1681,5002,14884,44530,
 133225,399310,1196836,3589414,10764961,32291602,
 96864964,290585050,871725625,2615147350,
 7845353476,23535971854,70607649841,211822683802,
 635467254244,1906400965570,5719200505225,
 17157599124190]

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Last modified February 17 02:33 EST 2019. Contains 320200 sequences. (Running on oeis4.)