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A203673 as a simple table

na(n)
11
221
3254163
411213968422384
56451450005117349260375984
6127857993263632065817610313129228311433216
7191199773886534869435599958788731398661833328276349525268803584

[1,21,254163,11213968422384,
 6451450005117349260375984,
 127857993263632065817610313129228311433216,
 19119977388653486943559995878873139866183332827634\
 9525268803584]