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A038816 as a simple table

na(n)
1664579
21270607
31857859
42433654
53001134
63562115
74118064
84669382
95216954
105761455
116303309
126841648
137378187
147912199
158444396
168974458
179503083
1810030385
1910555473
2011078937
2111601626
2212122540
2312642573

[664579,1270607,1857859,2433654,3001134,3562115,
 4118064,4669382,5216954,5761455,6303309,6841648,
 7378187,7912199,8444396,8974458,9503083,10030385,
 10555473,11078937,11601626,12122540,12642573]