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A166780 as a simple table

na(n)
10
20
30
42730
533586
6206864
7889743
83049239
98915556
1023162008
1154891826
12120841344
13250363790
14492955632

[0,0,0,2730,33586,206864,889743,3049239,8915556,
 23162008,54891826,120841344,250363790,492955632]