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A117917 as a simple table

n a(n)
0 1
1 4
2 15
3 52
4 175
5 582
6 1927
7 6370
8 21045
9 69514
10 229597
11 758316
12 2504557
13 8272000
14 27320571
15 90233728
16 298021771
17 984299058
18 3250918963
19 10737055966
20 35462086881
21 117123316630
22 386832036793
23 1277619427032
24 4219690317913

[1,4,15,52,175,582,1927,6370,21045,69514,229597,
 758316,2504557,8272000,27320571,90233728,
 298021771,984299058,3250918963,10737055966,
 35462086881,117123316630,386832036793,
 1277619427032,4219690317913]

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Last modified February 21 02:02 EST 2020. Contains 332086 sequences. (Running on oeis4.)