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A303991 as a simple table

na(n)
11
218
3804
470980
510436805
62303750526
7712510404592
8294018013725192
9156070751204023425
10103597044789173411410
1184072367255899882570876
1281892130447332894817380044
1394289343231845338982163322837
14126676207083751543195799431746150
15196394200592428254386554058525461440

[1,18,804,70980,10436805,2303750526,712510404592,
 294018013725192,156070751204023425,
 103597044789173411410,84072367255899882570876,
 81892130447332894817380044,
 94289343231845338982163322837,
 126676207083751543195799431746150,
 196394200592428254386554058525461440]