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A149615 as a simple table

n a(n)
0 1
1 1
2 5
3 15
4 63
5 243
6 1019
7 4273
8 18309
9 79537
10 347953
11 1540517
12 6848389
13 30699769
14 138103437
15 624792087
16 2835583031
17 12920696755
18 59038536867
19 270570671015
20 1242960486199
21 5723341739351
22 26406806760755
23 122069901607203
24 565252421469507
25 2621600015540423
26 12176517064331299
27 56632633782716711

[1,1,5,15,63,243,1019,4273,18309,79537,347953,
 1540517,6848389,30699769,138103437,624792087,
 2835583031,12920696755,59038536867,270570671015,
 1242960486199,5723341739351,26406806760755,
 122069901607203,565252421469507,2621600015540423,
 12176517064331299,56632633782716711]

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Last modified December 1 14:10 EST 2021. Contains 349430 sequences. (Running on oeis4.)