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A186619 as a simple table

na(n)
168719476736
278654
378654
4140552
53201
6140552
7654700
85072
95072
10654700
113764191
1225852
136758
1425852
153764191
1615228305
17137138
1830997
1930997
20137138
2115228305
2240150599
23451621
24172192
2588336
26172192
27451621
2840150599
2971051374

[68719476736,78654,78654,140552,3201,140552,
 654700,5072,5072,654700,3764191,25852,6758,25852,
 3764191,15228305,137138,30997,30997,137138,
 15228305,40150599,451621,172192,88336,172192,
 451621,40150599,71051374]