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A228827 as a simple table

n a(n)
0 1
1 25
2 599
3 4285
4 15599
5 169625
6 33578309
7 344155
8 133697983
9 941417335
10 1729982389
11 3184334285
12 274574499509
13 2625798955
14 1611022490371
15 123951819730625
16 9814145542783
17 3453861186955
18 -25128299959971711973
19 2945661954537595
20 -260933954573210488051

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

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Last modified September 18 18:20 EDT 2019. Contains 327178 sequences. (Running on oeis4.)