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A012594 as a simple table

na(n)
01
10
21
36
425
5140
61225
711410
8110353
91260696
1016597745
11233501598
123534940649
1358867014180
141060745261433
1520315286728490
16414362268698017
179016753267197744
18207836963025430369
195046234392527982902

[1,0,1,6,25,140,1225,11410,110353,1260696,
 16597745,233501598,3534940649,58867014180,
 1060745261433,20315286728490,414362268698017,
 9016753267197744,207836963025430369,
 5046234392527982902]