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A166316 as a simple table

na(n)
12
212
3232
463056
54221224224
618295693635288736320
7338921575014037816709507133224870496384
8115563265193225535967792084153637585725267224878335215248443107599191173632256

[2,12,232,63056,4221224224,18295693635288736320,
 338921575014037816709507133224870496384,
 11556326519322553596779208415363758572526722487833\
 5215248443107599191173632256]