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A084764 as a simple table

na(n)
01
14
231
31921
47380481
5108942999582721
623737154316161495960243527681
71126904990058528673830897031906808442930637286502826475521

[1,4,31,1921,7380481,108942999582721,
 23737154316161495960243527681,
 11269049900585286738308970319068084429306372865028\
 26475521]