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A146981 as a simple table

na(n)
14
29
325
449
5169
6361
7841
81369
91849
102209
113721
125041
137921
1410609
1511449
1616129
1717161
1819321
1929929
2036481
2144521
2249729
2354289
2457121
2566049
2685849
2797969
28113569
29128881
30177241
31196249
32201601
33218089
34241081
35273529
36292681
37323761

[4,9,25,49,169,361,841,1369,1849,2209,3721,5041,
 7921,10609,11449,16129,17161,19321,29929,36481,
 44521,49729,54289,57121,66049,85849,97969,113569,
 128881,177241,196249,201601,218089,241081,273529,
 292681,323761]