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A066264 as a simple table

na(n)
10
20
30
45
5141
62517
749835
81012858
924211837
10721500293
1122627459400
12844130935667
1334729870646917
141491483322755273
1569890000837179156

[0,0,0,5,141,2517,49835,1012858,24211837,
 721500293,22627459400,844130935667,34729870646917,
 1491483322755273,69890000837179156]