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A247539 as a simple table

na(n)
18
2217
31732
46495
516932
634695
762108
8103013
9156308
10227701
11316236
12428111
13559992
14721175
15905784
161123897
171368584
181654573
191970964
202330611
212725864
223169687
233650720
244190997
254769280
265406141
276091708
286842051
297638868
308509583

[8,217,1732,6495,16932,34695,62108,103013,156308,
 227701,316236,428111,559992,721175,905784,1123897,
 1368584,1654573,1970964,2330611,2725864,3169687,
 3650720,4190997,4769280,5406141,6091708,6842051,
 7638868,8509583]