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A020728 as a simple table

na(n)
02
19
240
3177
4783
53463
615315
767730
8299533
91324671
105858296
1125908042
12114577112
13506711954
142240910072
159910320668
1643827932664
17193826995709
18857190882207
193790886846546
2016765020932461
2174142526074589
22327891876477017
231450086587978657

[2,9,40,177,783,3463,15315,67730,299533,1324671,
 5858296,25908042,114577112,506711954,2240910072,
 9910320668,43827932664,193826995709,857190882207,
 3790886846546,16765020932461,74142526074589,
 327891876477017,1450086587978657]