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A250431 as a simple table

na(n)
1625
25625
350625
4275625
51500625
66002500
724010000
877792400
9252047376
10700131600
111944810000
124802490000
1311859210000
1426683222500
1560037250625
16125262905625
17261351000625
18512247961225
191004006004001
201866953313225

[625,5625,50625,275625,1500625,6002500,24010000,
 77792400,252047376,700131600,1944810000,
 4802490000,11859210000,26683222500,60037250625,
 125262905625,261351000625,512247961225,
 1004006004001,1866953313225]