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A249853 as a simple table

na(n)
14
25
36
410
520
621
725
840
944
1064
1190
12100
13129
14160
15200
16250
17360
18400
19490
20500
21600
22640
23810
241000
251210
261440
271690
281960
292000
302025
312100
322250
332500
342560
352890
363240
373610
384000
394400
404410
414840
425025
435290
445760
456250
466400
476760
487290
497840
508410

[4,5,6,10,20,21,25,40,44,64,90,100,129,160,200,
 250,360,400,490,500,600,640,810,1000,1210,1440,
 1690,1960,2000,2025,2100,2250,2500,2560,2890,3240,
 3610,4000,4400,4410,4840,5025,5290,5760,6250,6400,
 6760,7290,7840,8410]