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A181488 as a simple table

na(n)
139
249
391
4133
5763
615883
721207
832761
9180739
10268423
11746607
122277163
1328604419
1493742347
1513192600483
16124387470307
173898087261291
1813987912482103
1969089500671469

[39,49,91,133,763,15883,21207,32761,180739,268423,
 746607,2277163,28604419,93742347,13192600483,
 124387470307,3898087261291,13987912482103,
 69089500671469]