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A125330 as a simple table

na(n)
01
120
2128
3656
43928
523840
6148304
7934968
85958552
938285216
10247607348
111609914524
1210513615792
1368913452056
14453123210178
152987405569166
1619741419610536
17130718419293680
18867078544410362
195760352822741182

[1,20,128,656,3928,23840,148304,934968,5958552,
 38285216,247607348,1609914524,10513615792,
 68913452056,453123210178,2987405569166,
 19741419610536,130718419293680,867078544410362,
 5760352822741182]