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A253795 as a simple table

na(n)
12908
222284
3162604
41143216
57346584
645394736
7275822532
81652471284
99831849372
1058304555060
11345075369836
122040178453940
1312055498430504
1471214711130240
15420611891390560
162484014741580956
1714669164876517016

[2908,22284,162604,1143216,7346584,45394736,
 275822532,1652471284,9831849372,58304555060,
 345075369836,2040178453940,12055498430504,
 71214711130240,420611891390560,2484014741580956,
 14669164876517016]