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A259331
as a simple table
n
a(n)
1
1
2
1
3
1
4
20
5
228229620041151627
6
6559900643155884106407005800995037605507731066841784640626478359
[1,1,1,20,228229620041151627, 65599006431558841064070058009950376055077310668417\ 84640626478359]