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A250637 as a simple table

na(n)
12856
220743
3134878
4747039
53719562
617202711
775537881
8319253573
91310889946
105265378033
1120784710664
1280962828536
13312026929609
141192861371366
154530539131712
1617123596908104
1764464780855588
18241988292316472

[2856,20743,134878,747039,3719562,17202711,
 75537881,319253573,1310889946,5265378033,
 20784710664,80962828536,312026929609,
 1192861371366,4530539131712,17123596908104,
 64464780855588,241988292316472]