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A123960 as a simple table

na(n)
10
20
30
42
522
6152
7842
84084
918116
1075408
11299730
121152834
134338280
1416126958
1559713888
16221713192
17829301072
183132108250
1911945717358
2045938159040
21177695375802
22689616061412
232679197337100
2410403108215760
2540332521702522

[0,0,0,2,22,152,842,4084,18116,75408,299730,
 1152834,4338280,16126958,59713888,221713192,
 829301072,3132108250,11945717358,45938159040,
 177695375802,689616061412,2679197337100,
 10403108215760,40332521702522]