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A252982 as a simple table

na(n)
115
2145
31836
427905
5433401
65672484
760650883
8766674140
94970634131
1018692194423
1149050683133
12101029007619
13176694157069
14276519316503
15400550856993
16548788778539
17721233081141
18917883764799
191138740829513

[15,145,1836,27905,433401,5672484,60650883,
 766674140,4970634131,18692194423,49050683133,
 101029007619,176694157069,276519316503,
 400550856993,548788778539,721233081141,
 917883764799,1138740829513]