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A215007 as a simple table

n a(n)
0 1
1 3
2 9
3 28
4 91
5 308
6 1078
7 3871
8 14161
9 52479
10 196196
11 737793
12 2785160
13 10540390
14 39955041
15 151615947
16 575723785
17 2187128524
18 8311078307
19 31587815308
20 120069510526
21 456434707519
22 1735184512425
23 6596692255391
24 25079305566420

[1,3,9,28,91,308,1078,3871,14161,52479,196196,
 737793,2785160,10540390,39955041,151615947,
 575723785,2187128524,8311078307,31587815308,
 120069510526,456434707519,1735184512425,
 6596692255391,25079305566420]

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Last modified July 11 23:53 EDT 2020. Contains 335654 sequences. (Running on oeis4.)