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A185557 as a simple table

na(n)
121
213256
32792166
4684657326
5160107914496
638323943289566
79079893278572272
82159859526859795892

[21,13256,2792166,684657326,160107914496,
 38323943289566,9079893278572272,
 2159859526859795892]