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A006262 as a simple table

na(n)
11
22
318
44608
51800000000
65077997833420800000000
75608281336980602120684110607059901336780800000000

[1,2,18,4608,1800000000,5077997833420800000000,
 5608281336980602120684110607059901336780800000000]