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A270381 as a simple table

na(n)
12
24
38
476
59076
676367616
78970505418837847
8105072872079226455591148215294656
926036426776932682309708313847332475352524205664479930813102637500

[2,4,8,76,9076,76367616,8970505418837847,
 105072872079226455591148215294656,
 26036426776932682309708313847332475352524205664479\
 930813102637500]