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A280842 as a simple table

na(n)
12
22
32
43456
541472000
64147200000
750185433088000000
8295090346557440000000
99251918060437194670080000000
103330690501757390081228800000000
118312243866372850396258184884618526720000000000

[2,2,2,3456,41472000,4147200000,50185433088000000,
 295090346557440000000,
 9251918060437194670080000000,
 3330690501757390081228800000000,
 8312243866372850396258184884618526720000000000]