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A047810 as a simple table

na(n)
00
14
220
356
4120
5220
6364
7560
8816
91140
101540
112024
122600
133276
144060
154960
165984

[0,4,20,56,120,220,364,560,816,1140,1540,2024,
 2600,3276,4060,4960,5984]