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A161736 as a simple table

na(n)
21
39
475
51225
619845
7160083
81288287
941409225
101329696225
1110667118605
1285530896451
131371086188563
1421972535073125
15176021737014375
161409850293610375
1790324408810638025
185786075364399106425
1946326420401234675625
20370882277949065911875

[1,9,75,1225,19845,160083,1288287,41409225,
 1329696225,10667118605,85530896451,1371086188563,
 21972535073125,176021737014375,1409850293610375,
 90324408810638025,5786075364399106425,
 46326420401234675625,370882277949065911875]