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A206223 as a simple table

na(n)
181
2452
3452
41970
57313
61970
78128
873133
973133
108128
1133386
12656053
131782191
14656053
1533386
16139390
175862927
1835625711
1935625711
205862927
21139390
22588254
2353835891
24600064928
251827047303
26600064928
2753835891
28588254
292496440

[81,452,452,1970,7313,1970,8128,73133,73133,8128,
 33386,656053,1782191,656053,33386,139390,5862927,
 35625711,35625711,5862927,139390,588254,53835891,
 600064928,1827047303,600064928,53835891,588254,
 2496440]