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A124497 as a simple table

n a(n)
0 1
1 1
2 2
3 4
4 9
5 20
6 48
7 116
8 288
9 724
10 1849
11 4768
12 12423
13 32628
14 86342
15 229952
16 616042
17 1659012
18 4489101
19 12199521
20 33284546
21 91140797
22 250396629
23 690043032
24 1907022197
25 5284167884
26 14677681554
27 40862469713
28 114001697975

[1,1,2,4,9,20,48,116,288,724,1849,4768,12423,
 32628,86342,229952,616042,1659012,4489101,
 12199521,33284546,91140797,250396629,690043032,
 1907022197,5284167884,14677681554,40862469713,
 114001697975]

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Last modified January 20 12:50 EST 2019. Contains 319330 sequences. (Running on oeis4.)