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A026553 as a simple table

n a(n)
0 1
1 1
2 3
3 4
4 12
5 20
6 58
7 104
8 300
9 556
10 1608
11 3032
12 8806
13 16778
14 48924
15 93872
16 274644
17 529684
18 1553940
19 3008864
20 8846772
21 17184188
22 50618184
23 98577712
24 290817566
25 567591142
26 1676640462
27 3278348608
28 9694857750
29 18986482250

[1,1,3,4,12,20,58,104,300,556,1608,3032,8806,
 16778,48924,93872,274644,529684,1553940,3008864,
 8846772,17184188,50618184,98577712,290817566,
 567591142,1676640462,3278348608,9694857750,
 18986482250]

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Last modified September 24 14:00 EDT 2020. Contains 337321 sequences. (Running on oeis4.)