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A201239 as a simple table

na(n)
10
20
30
4128
56745
6100332
7754453
83830016
915038541
1049207020
11140410699
12360001152
13846775007
141855033964
153828109545
167507096576
1714087087961
1825436160108
1944395753647
2075184958080
21123935571963
22199389702380
23313797119069
24484055619840
25733144325125

[0,0,0,128,6745,100332,754453,3830016,15038541,
 49207020,140410699,360001152,846775007,1855033964,
 3828109545,7507096576,14087087961,25436160108,
 44395753647,75184958080,123935571963,199389702380,
 313797119069,484055619840,733144325125]