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A250429 as a simple table

na(n)
1256
21600
310000
440000
5160000
6490000
71500625
83841600
99834496
1022127616
1149787136
12101606400
13207360000
14392040000
15741200625
161317690000
172342560000
183958926400
196690585616
2010837642816
2117555190016
2227429984400
2342859350625

[256,1600,10000,40000,160000,490000,1500625,
 3841600,9834496,22127616,49787136,101606400,
 207360000,392040000,741200625,1317690000,
 2342560000,3958926400,6690585616,10837642816,
 17555190016,27429984400,42859350625]