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A173963 as a simple table

na(n)
10
20
320
4108
5336
6800
71620
82940
94928
107776
1111700
1216940
1323760
1432448
1543316
1656700
1772960
1892480
19115668
20142956
21174800
22211680
23254100
24302588
25357696
26420000
27490100
28568620
29656208
30753536
31861300
32980220
331111040
341254528

[0,0,20,108,336,800,1620,2940,4928,7776,11700,
 16940,23760,32448,43316,56700,72960,92480,115668,
 142956,174800,211680,254100,302588,357696,420000,
 490100,568620,656208,753536,861300,980220,1111040,
 1254528]