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A077486 as a simple table

na(n)
19
281
3841
48649
564009
60
74004001
80
9900000000
100
1140000400001
120
139000000000000
140
15400000040000001
160
1790000000000000000
180
194000000004000000001
200
21900000000000000000000
220
2340000000000400000000001

[9,81,841,8649,64009,0,4004001,0,900000000,0,
 40000400001,0,9000000000000,0,400000040000001,0,
 90000000000000000,0,4000000004000000001,0,
 900000000000000000000,0,40000000000400000000001]