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A081459 as a simple table

na(n)
12
29
3161
451841
55374978561
657780789062419261441
76677239169351578707225356193679818792961
889171045849445921581733341920411050611581102638589828325078491812417901966295041

[2,9,161,51841,5374978561,57780789062419261441,
 6677239169351578707225356193679818792961,
 89171045849445921581733341920411050611581102638589\
 828325078491812417901966295041]