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A001266 as a simple table

na(n)
20
30
41
57
645
7323
82621
923811
10239653
112648395
1231889517
13415641779
145830753109
1587601592187
161403439027805
1723883728565283
18430284458893701
198181419271349931
20163730286973255373
213440164703027845395
2275718273707281368117
231742211593431076483419

[0,0,1,7,45,323,2621,23811,239653,2648395,
 31889517,415641779,5830753109,87601592187,
 1403439027805,23883728565283,430284458893701,
 8181419271349931,163730286973255373,
 3440164703027845395,75718273707281368117,
 1742211593431076483419]