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A149489 as a simple table

n a(n)
0 1
1 1
2 4
3 14
4 52
5 209
6 860
7 3611
8 15470
9 67075
10 293936
11 1299135
12 5782369
13 25890073
14 116507143
15 526584341
16 2389109731
17 10875671609
18 49655540621
19 227316843705
20 1043115351009
21 4797021425961
22 22103655032502
23 102032014882075
24 471763934655236
25 2184603451900384
26 10130495327004170
27 47038661457594876

[1,1,4,14,52,209,860,3611,15470,67075,293936,
 1299135,5782369,25890073,116507143,526584341,
 2389109731,10875671609,49655540621,227316843705,
 1043115351009,4797021425961,22103655032502,
 102032014882075,471763934655236,2184603451900384,
 10130495327004170,47038661457594876]

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Last modified June 28 12:59 EDT 2022. Contains 354907 sequences. (Running on oeis4.)