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A228827 as a simple table

na(n)
01
125
2599
34285
415599
5169625
633578309
7344155
8133697983
9941417335
101729982389
113184334285
12274574499509
132625798955
141611022490371
15123951819730625
169814145542783
173453861186955
18-25128299959971711973
192945661954537595
20-260933954573210488051

[1,25,599,4285,15599,169625,33578309,344155,
 133697983,941417335,1729982389,3184334285,
 274574499509,2625798955,1611022490371,
 123951819730625,9814145542783,3453861186955,
 -25128299959971711973,2945661954537595,
 -260933954573210488051]