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A270353 as a simple table

na(n)
18
231
3540
4189864
522502468823
6547694780221174920178
7287920070745319667821031437298831171428290
8271667810016366767427285213650617821610883263237085072498040538105208873088855853524

[8,31,540,189864,22502468823,
 547694780221174920178,
 287920070745319667821031437298831171428290,
 27166781001636676742728521365061782161088326323708\
 5072498040538105208873088855853524]