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A087668号作为一个简单的表

n个a(n)
18
29
11
413
515
6133
72317
839845
9108167
1046779959
1170246181
12248897669
13452691117
141137506437
153089581031

[8,9,11,13,15,133,2317,39845,108167,46779959,70246181,248897669,452691117,1137506437,3089581031]