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A210426 as a simple table

na(n)
10
20
30
41
544
6450
73175
817977
991326
10433434
111968268
128674028
1337428470
14159059732

[0,0,0,1,44,450,3175,17977,91326,433434,1968268,
 8674028,37428470,159059732]