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A270337 as a simple table

na(n)
19
225
328
440
545
649
781
8121
9153
10169
11225
12289
13325
14343
15361
16441
17529
18625
19640
20841
21961
22976
231089
241225
251369
261521
271681
281849
292133
302197
312209
322401
332541
342601
352809
363025
373249
383481
393721
404225
414489
424753
434761
444851
455041
465329
475929
486241
496348
506561
516859
526889

[9,25,28,40,45,49,81,121,153,169,225,289,325,343,
 361,441,529,625,640,841,961,976,1089,1225,1369,
 1521,1681,1849,2133,2197,2209,2401,2541,2601,2809,
 3025,3249,3481,3721,4225,4489,4753,4761,4851,5041,
 5329,5929,6241,6348,6561,6859,6889]