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A181574 as a simple table

na(n)
11
23
39
418
554
690
7270
8450
9900
101500
114500
126300
1318900
1431500
1552500
1678750
17236250
18330750
19992250
201389150
212315250
223858750
2311576250
2414883750
2529767500
2649612500
2782687500
28115762500
29347287500
30446512500
311339537500
321875352500
333125587500

[1,3,9,18,54,90,270,450,900,1500,4500,6300,18900,
 31500,52500,78750,236250,330750,992250,1389150,
 2315250,3858750,11576250,14883750,29767500,
 49612500,82687500,115762500,347287500,446512500,
 1339537500,1875352500,3125587500]