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A073506 as a simple table

na(n)
11
27
342
4310
52402
619665
7166230
81440474
912712499
10113765625
111029509448
129401979904
1386516427946

[1,7,42,310,2402,19665,166230,1440474,12712499,
 113765625,1029509448,9401979904,86516427946]