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A051675 as a simple table

na(n)
11
216
3314928
41352605460594688
5403107840000000000000000000000000
64157825501361955044460594652554199040000000000000000000000000

[1,16,314928,1352605460594688,
 403107840000000000000000000000000,
 41578255013619550444605946525541990400000000000000\
 00000000000]