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A099142 as a simple table

na(n)
01
18
292
31184
415632
5207488
62757056
736643328
8487039232
96473467904
1086042074112
111143628341248
1215200538791936
13202038000386048
142685388609667072
1535692849740775424
16474411605904392192

[1,8,92,1184,15632,207488,2757056,36643328,
 487039232,6473467904,86042074112,1143628341248,
 15200538791936,202038000386048,2685388609667072,
 35692849740775424,474411605904392192]