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A005828 as a simple table

na(n)
04
131
21921
37380481
4108942999582721
523737154316161495960243527681
61126904990058528673830897031906808442930637286502826475521

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