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A190401 as a simple table

na(n)
10
20
30
4384
519100
6557808
75841780
841338400
9209264796
10859752800
112982181004
129131392296
1325196132260
1463968987264
15151223202900
16336724832384
17711538908572
181437022315440
192787781494732
205219454908200
219464698212228

[0,0,0,384,19100,557808,5841780,41338400,
 209264796,859752800,2982181004,9131392296,
 25196132260,63968987264,151223202900,336724832384,
 711538908572,1437022315440,2787781494732,
 5219454908200,9464698212228]