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A064845 as a simple table

na(n)
11
21
32
45
531
61231
71917121
84667676800641
927640053867460068128570881
10969475805641849161579046591814284573846079748476161

[1,1,2,5,31,1231,1917121,4667676800641,
 27640053867460068128570881,
 96947580564184916157904659181428457384607974847616\
 1]