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A207750 as a simple table

na(n)
116
2256
31296
44900
523716
6104976
7509796
82421136
911943936
1058828900
11294946276
121484406784
137542922500
1438500718656
15197686944400
161018981226916
175273535630724
1827375958697616
19142523723188900
20743755656909456

[16,256,1296,4900,23716,104976,509796,2421136,
 11943936,58828900,294946276,1484406784,7542922500,
 38500718656,197686944400,1018981226916,
 5273535630724,27375958697616,142523723188900,
 743755656909456]