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A068542 as a simple table

na(n)
13
21
3370
4123456790
5411522633744855967078189300
6137174211248285322359396433470507544581618655692729766803840877914951989026063100

[3,1,370,123456790,411522633744855967078189300,
 13717421124828532235939643347050754458161865569272\
 9766803840877914951989026063100]