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A063830 as a simple table

n a(n)
1 1
2 3
3 9
4 21
5 45
6 117
7 297
8 585
9 1521
10 3105
11 6993
12 14553
13 43653
14 90885
15 185925
16 397125
17 847125
18 1813125
19 3238725
20 7556829
21 17253789
22 36910365
23 94571997
24 220301277
25 475043037
26 47979336637
27 183450404605
28 525019294077

[1,3,9,21,45,117,297,585,1521,3105,6993,14553,
 43653,90885,185925,397125,847125,1813125,3238725,
 7556829,17253789,36910365,94571997,220301277,
 475043037,47979336637,183450404605,525019294077]

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Last modified July 29 00:31 EDT 2021. Contains 346340 sequences. (Running on oeis4.)