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A080491 as a simple table

na(n)
16
236
3396
430096
53009600
6300960000
730096000000
83009600000000
9300960000000000
1030096000000000000
113009600000000000000
12300960000000000000000
1330096000000000000000000

[6,36,396,30096,3009600,300960000,30096000000,
 3009600000000,300960000000000,30096000000000000,
 3009600000000000000,300960000000000000000,
 30096000000000000000000]