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A047123 as a simple table

n a(n)
1 1
2 1
3 4
4 16
5 58
6 215
7 806
8 3051
9 11602
10 44307
11 169840
12 653204
13 2519314
14 9740350
15 37739300
16 146498531
17 569642584
18 2218322463
19 8650367796
20 33773500347
21 132008143328
22 516495270723
23 2022721237326
24 7928249018667
25 31100068617294

[1,1,4,16,58,215,806,3051,11602,44307,169840,
 653204,2519314,9740350,37739300,146498531,
 569642584,2218322463,8650367796,33773500347,
 132008143328,516495270723,2022721237326,
 7928249018667,31100068617294]

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Last modified December 1 22:12 EST 2021. Contains 349435 sequences. (Running on oeis4.)