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A166475 as a simple table

na(n)
01
12
248
3414720
4270888468480000
530900096179361042923520000000000
61848494880770448654906901042987600267878400000000000000000000

[1,2,48,414720,270888468480000,
 30900096179361042923520000000000,
 18484948807704486549069010429876002678784000000000\
 00000000000]