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A286983 as a simple table

n a(n)
1 1
2 2
3 4
4 9
5 20
6 48
7 117
8 294
9 748
10 1925
11 4984
12 12960
13 33785
14 88218
15 230580
16 603057
17 1577836
18 4129232
19 10807885
20 28291230
21 74060636
22 193882317
23 507572784
24 1328814144
25 3478834225
26 9107631218
27 23843966692
28 62424118809
29 163428146948
30 427859929200
31 1120151005029
32 2932592057430

[1,2,4,9,20,48,117,294,748,1925,4984,12960,33785,
 88218,230580,603057,1577836,4129232,10807885,
 28291230,74060636,193882317,507572784,1328814144,
 3478834225,9107631218,23843966692,62424118809,
 163428146948,427859929200,1120151005029,
 2932592057430]

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Last modified October 23 20:59 EDT 2018. Contains 316537 sequences. (Running on oeis4.)