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A166990型作为一个简单的表

n个a(n)
01
12
27
30
4147
5786
64472
726644
8164477
91044258
106782484
1144887236
12301782361
132056250570
1414172792355
1598667874038
16692948001906
174904403499992
1834951124337300
19250617829087656
201807055528439771
2113095146839953030

[1,2,7,30,147,786,4472,26644,164477,1044258,6782484,44887236,301782361,2056250570,14172792355,98667874038,692948001906,4904403499992,34951124337300,250617829087656,1807055528439771,13095146839953030]