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A267729 as a simple table

na(n)
14
216
364
4225
5784
62601
78464
826896
984100
10259081
11788544
122374681
137086244
1420976400
1561653904
16180069561
17522945424
181510954641
194345446400
2012444741136
2135502850084
22100926300721
23285976813824
24807886380625
252275928269924

[4,16,64,225,784,2601,8464,26896,84100,259081,
 788544,2374681,7086244,20976400,61653904,
 180069561,522945424,1510954641,4345446400,
 12444741136,35502850084,100926300721,285976813824,
 807886380625,2275928269924]