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A121625 as a simple table

na(n)
01
11
20
3-54
4-1024
5-12500
60
76588344
8268435456
96198727824
100
11-9129973459552
12-570630428688384
13-19384006821904192
140
1556050417968750000000
164722366482869645213696
17211773507042902211629312
180
19-1012950863698080557631477248
20-107374182400000000000000000000

[1,1,0,-54,-1024,-12500,0,6588344,268435456,
 6198727824,0,-9129973459552,-570630428688384,
 -19384006821904192,0,56050417968750000000,
 4722366482869645213696,211773507042902211629312,0,
 -1012950863698080557631477248,
 -107374182400000000000000000000]