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A000560 as a simple table

n a(n)
2 1
3 2
4 5
5 12
6 33
7 87
8 252
9 703
10 2105
11 6099
12 18689
13 55639
14 173423
15 526937
16 1664094
17 5137233
18 16393315
19 51255709
20 164951529
21 521138861
22 1688959630
23 5382512216
24 17547919924
25 56335234064
26 184596351277
27 596362337295
28 1962723402375

[1,2,5,12,33,87,252,703,2105,6099,18689,55639,
 173423,526937,1664094,5137233,16393315,51255709,
 164951529,521138861,1688959630,5382512216,
 17547919924,56335234064,184596351277,596362337295,
 1962723402375]

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Last modified February 20 14:52 EST 2019. Contains 320327 sequences. (Running on oeis4.)