A289734 - OEIS

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A289734 as a simple table

n	a(n)
1	13
2	197
3	613
4	13404133
5	24663654373
6	37455569511954513919973
7	448140631309739369262009548799973
8	38794993239276710062728555790335999973

[13,197,613,13404133,24663654373, 37455569511954513919973, 448140631309739369262009548799973, 38794993239276710062728555790335999973]