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A024121 as a simple table

na(n)
01
19
2-28
3-1187
4-6384
521875
6720064
79176457
897902848
9995217031
109990000000
1199980512829
12999964168192
139999937251483
1499999894586496
15999999829140625
169999999731564544
1799999999589661327
18999999999387779968

[1,9,-28,-1187,-6384,21875,720064,9176457,
 97902848,995217031,9990000000,99980512829,
 999964168192,9999937251483,99999894586496,
 999999829140625,9999999731564544,
 99999999589661327,999999999387779968]