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A052911 as a simple table

n a(n)
0 1
1 2
2 7
3 21
4 66
5 205
6 639
7 1990
8 6199
9 19309
10 60146
11 187349
12 583575
13 1817782
14 5662223
15 17637301
16 54938562
17 171128541
18 533049583
19 1660400166
20 5171992999
21 16110279997
22 50182032658
23 156312391973
24 486898648583
25 1516644272406

[1,2,7,21,66,205,639,1990,6199,19309,60146,187349,
 583575,1817782,5662223,17637301,54938562,
 171128541,533049583,1660400166,5171992999,
 16110279997,50182032658,156312391973,486898648583,
 1516644272406]

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Last modified February 27 10:15 EST 2020. Contains 332304 sequences. (Running on oeis4.)