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A001654 as a simple table

n a(n)
0 0
1 1
2 2
3 6
4 15
5 40
6 104
7 273
8 714
9 1870
10 4895
11 12816
12 33552
13 87841
14 229970
15 602070
16 1576239
17 4126648
18 10803704
19 28284465
20 74049690
21 193864606
22 507544127
23 1328767776
24 3478759200
25 9107509825
26 23843770274
27 62423800998
28 163427632719

[0,1,2,6,15,40,104,273,714,1870,4895,12816,33552,
 87841,229970,602070,1576239,4126648,10803704,
 28284465,74049690,193864606,507544127,1328767776,
 3478759200,9107509825,23843770274,62423800998,
 163427632719]

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Last modified January 22 10:52 EST 2020. Contains 331144 sequences. (Running on oeis4.)