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A275185 as a simple table

na(n)
18
221
385
4353
51465
66081
725241
8104769
9434873
101805057
117492377
1231099137
13129085369
14535803713
152223998105
169231305153
1738317026745
18159045174401
19660159977241
202740172389249
2111373826014393
2247210138571457

[8,21,85,353,1465,6081,25241,104769,434873,
 1805057,7492377,31099137,129085369,535803713,
 2223998105,9231305153,38317026745,159045174401,
 660159977241,2740172389249,11373826014393,
 47210138571457]