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A047123 as a simple table

na(n)
11
21
34
416
558
6215
7806
83051
911602
1044307
11169840
12653204
132519314
149740350
1537739300
16146498531
17569642584
182218322463
198650367796
2033773500347
21132008143328
22516495270723
232022721237326
247928249018667
2531100068617294

[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]