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A161699 as a simple table

na(n)
01
16
220
350
4104
5190
6315
7484
8699
9958
101255
111580
121919
132254
142565
152832
163037
173166
183210
193166
203037
212832
222565
232254
241919
251580
261255
27958
28699
29484
30315
31190
32104
3350
3420
356
361

[1,6,20,50,104,190,315,484,699,958,1255,1580,1919,
 2254,2565,2832,3037,3166,3210,3166,3037,2832,2565,
 2254,1919,1580,1255,958,699,484,315,190,104,50,20,
 6,1]