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A195636 as a simple table

na(n)
15
273
31481
43965
546909
64154725
72542285
842877777
977493013
10583422269
11543086777
12102892405433
13865968783805
142679112443289
1510532351275849
1638768422373609
17116987137407325
18145223208505085
193837000286630513
206238790337745589

[5,73,1481,3965,46909,4154725,2542285,42877777,
 77493013,583422269,543086777,102892405433,
 865968783805,2679112443289,10532351275849,
 38768422373609,116987137407325,145223208505085,
 3837000286630513,6238790337745589]