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A000944 as a simple table

na(n)
10
20
30
41
52
67
734
8257
92606
1032300
11440564
126384634
1396262938
141496225352
1523833988129
16387591510244
176415851530241
18107854282197058

[0,0,0,1,2,7,34,257,2606,32300,440564,6384634,
 96262938,1496225352,23833988129,387591510244,
 6415851530241,107854282197058]