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A320526 as a simple table

na(n)
10
20
30
42
510
640
7141
8464
91480
104600
1114145
1243052
13130480
14393820
151186521
163568784
1710725760
1832213200
1996714465
20290284052
21871142800
222613981700
237843080201
2423531425304
2570598731840
26211804847800
27635432109585
281906330676252
295719061512720
3017157321139180

[0,0,0,2,10,40,141,464,1480,4600,14145,43052,
 130480,393820,1186521,3568784,10725760,32213200,
 96714465,290284052,871142800,2613981700,
 7843080201,23531425304,70598731840,211804847800,
 635432109585,1906330676252,5719061512720,
 17157321139180]