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A109721 as a simple table

na(n)
01
13
221
377
4252
5567
61051
71465
81674
91465
101051
11567
12252
1377
1421
153
161

[1,3,21,77,252,567,1051,1465,1674,1465,1051,567,
 252,77,21,3,1]