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A231994 as a simple table

na(n)
181
21225
328900
4674041
515594601
6362293156
78404672329
8195072388900
94526898777801
10105058031047524
112438091190374961
1256581345271408896
131313093651031910225
1430473226515305728361
15707198080089528623376

[81,1225,28900,674041,15594601,362293156,
 8404672329,195072388900,4526898777801,
 105058031047524,2438091190374961,
 56581345271408896,1313093651031910225,
 30473226515305728361,707198080089528623376]