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A249222 as a simple table

na(n)
11
25
36
425
531
6125
7156
8625
9781
103125
113906
1215625
1319531
1478125
1597656
16390625
17488281
181953125
192441406
209765625
2112207031
2248828125
2361035156
24244140625
25305175781
261220703125
271525878906
286103515625
297629394531
3030517578125
3138146972656
32152587890625

[1,5,6,25,31,125,156,625,781,3125,3906,15625,
 19531,78125,97656,390625,488281,1953125,2441406,
 9765625,12207031,48828125,61035156,244140625,
 305175781,1220703125,1525878906,6103515625,
 7629394531,30517578125,38146972656,152587890625]