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A258801 as a simple table

na(n)
1561
262745
3656601
411921001
526719701
645318561
7174352641
8230996949
9662086041
10684106401
11689880801
121534274841
131848112761
142176838049
153022354401
165860426881
176025532241
186097778961
197281824001
207397902401
2110031651841
2210054063041
2310585115841

[561,62745,656601,11921001,26719701,45318561,
 174352641,230996949,662086041,684106401,689880801,
 1534274841,1848112761,2176838049,3022354401,
 5860426881,6025532241,6097778961,7281824001,
 7397902401,10031651841,10054063041,10585115841]