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A186561 as a simple table

na(n)
1721
2173
3401
41411
52617
63379
74033
84795
96361
1010443
1117153
1226995
1343177
1466139
1598497
16151699
17231881
18350539
19543249
20835843
211270105
221958875
233007777
244577331
257041321
2610810763
2716490033
2825335715
2938890105
3059403259
3191177217

[721,173,401,1411,2617,3379,4033,4795,6361,10443,
 17153,26995,43177,66139,98497,151699,231881,
 350539,543249,835843,1270105,1958875,3007777,
 4577331,7041321,10810763,16490033,25335715,
 38890105,59403259,91177217]