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A207640 as a simple table

na(n)
1225
2361
3625
4900
51444
62500
73600
85776
910000
1014400
1123104
1240000
1357600
1492416
15160000
16230400
17369664
18640000
19921600
201478656
212560000
223686400

[225,361,625,900,1444,2500,3600,5776,10000,14400,
 23104,40000,57600,92416,160000,230400,369664,
 640000,921600,1478656,2560000,3686400]