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A002861 as a simple table

n a(n)
1 1
2 2
3 4
4 9
5 20
6 51
7 125
8 329
9 862
10 2311
11 6217
12 16949
13 46350
14 127714
15 353272
16 981753
17 2737539
18 7659789
19 21492286
20 60466130
21 170510030
22 481867683
23 1364424829
24 3870373826
25 10996890237
26 31293083540
27 89173833915
28 254445242754
29 726907585652
30 2079012341822

[1,2,4,9,20,51,125,329,862,2311,6217,16949,46350,
 127714,353272,981753,2737539,7659789,21492286,
 60466130,170510030,481867683,1364424829,
 3870373826,10996890237,31293083540,89173833915,
 254445242754,726907585652,2079012341822]

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Last modified April 24 10:11 EDT 2019. Contains 322420 sequences. (Running on oeis4.)