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A086690 as a simple table

na(n)
12
24
311
431
5309
61028
712251
843390
9564163
1028192750
11105097565
125586502348
1380316571436
14305761713237
154461632979717
16252252704148404
1714458792895301660
1855890484045084135
193249254387052557215
2048995571600129458363
21190499823401327905601

[2,4,11,31,309,1028,12251,43390,564163,28192750,
 105097565,5586502348,80316571436,305761713237,
 4461632979717,252252704148404,14458792895301660,
 55890484045084135,3249254387052557215,
 48995571600129458363,190499823401327905601]