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A172591 as a simple table

na(n)
11
21172556
3306407299538340
42144953893641078315315520
5178394712594906480448637769546038400
6107858549105202487690102571993535153527817734400

[1,1172556,306407299538340,
 2144953893641078315315520,
 178394712594906480448637769546038400,
 107858549105202487690102571993535153527817734400]