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A246653 as a simple table

n a(n)
0 1
1 1
2 3
3 9
4 25
5 87
6 287
7 993
8 3519
9 12525
10 45369
11 165519
12 608569
13 2253307
14 8386575
15 31370297
16 117834837
17 444258387
18 1680516731
19 6375706325
20 24253227159
21 92481509389
22 353417696625
23 1353280137975
24 5191349266275
25 19948136148837
26 76771074483837
27 295880290515411
28 1141860205058433
29 4412129801125275

[1,1,3,9,25,87,287,993,3519,12525,45369,165519,
 608569,2253307,8386575,31370297,117834837,
 444258387,1680516731,6375706325,24253227159,
 92481509389,353417696625,1353280137975,
 5191349266275,19948136148837,76771074483837,
 295880290515411,1141860205058433,4412129801125275]

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Last modified July 26 01:20 EDT 2021. Contains 346294 sequences. (Running on oeis4.)