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A293996 as a simple table

n a(n)
0 1
1 1
2 3
3 15
4 105
5 315
6 1141
7 4779
8 21101
9 80559
10 314185
11 1267551
12 5160933
13 20504123
14 81554685
15 326682775
16 1310978305
17 5239019143
18 20931551661
19 83743554723
20 335175239813
21 1340542340399
22 5360923216953
23 21444223178271
24 85786427569333
25 343141430067947

[1,1,3,15,105,315,1141,4779,21101,80559,314185,
 1267551,5160933,20504123,81554685,326682775,
 1310978305,5239019143,20931551661,83743554723,
 335175239813,1340542340399,5360923216953,
 21444223178271,85786427569333,343141430067947]

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Last modified August 4 09:36 EDT 2021. Contains 346446 sequences. (Running on oeis4.)