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A048739 as a simple table

n a(n)
0 1
1 3
2 8
3 20
4 49
5 119
6 288
7 696
8 1681
9 4059
10 9800
11 23660
12 57121
13 137903
14 332928
15 803760
16 1940449
17 4684659
18 11309768
19 27304196
20 65918161
21 159140519
22 384199200
23 927538920
24 2239277041
25 5406093003
26 13051463048
27 31509019100
28 76069501249

[1,3,8,20,49,119,288,696,1681,4059,9800,23660,
 57121,137903,332928,803760,1940449,4684659,
 11309768,27304196,65918161,159140519,384199200,
 927538920,2239277041,5406093003,13051463048,
 31509019100,76069501249]

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Last modified December 15 15:10 EST 2019. Contains 329999 sequences. (Running on oeis4.)