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A106520 as a simple table

na(n)
11
20
30
40
52
64
718
848
9156
10472
111526
124852
1316000
1452940
15178276
16605520
172079862
187201084
1925138878
2088358520
21312576996
221112087012
233977502766
2414294093652
2551596165872
26186997738504
27680272334202
282483340387644
299094756956908

[1,0,0,0,2,4,18,48,156,472,1526,4852,16000,52940,
 178276,605520,2079862,7201084,25138878,88358520,
 312576996,1112087012,3977502766,14294093652,
 51596165872,186997738504,680272334202,
 2483340387644,9094756956908]