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A098615 as a simple table

na(n)
01
11
23
35
413
525
661
7125
8295
9625
101447
113125
127151
1315625
1435491
1578125
16176597
17390625
18880125
191953125
204390901
219765625
2221920913
2348828125
24109486993
25244140625
26547018941
271220703125
282733608905
296103515625
3013662695645
3130517578125
3268294088535
33152587890625
34341399727335
35762939453125
361706739347095
373814697265625
388532741458075
3919073486328125
4042660172763995
4195367431640625

[1,1,3,5,13,25,61,125,295,625,1447,3125,7151,
 15625,35491,78125,176597,390625,880125,1953125,
 4390901,9765625,21920913,48828125,109486993,
 244140625,547018941,1220703125,2733608905,
 6103515625,13662695645,30517578125,68294088535,
 152587890625,341399727335,762939453125,
 1706739347095,3814697265625,8532741458075,
 19073486328125,42660172763995,95367431640625]