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A006348 as a simple table

na(n)
10
21
34
425
5174
61393
712536
8125361
91378970
1016547641
11215119332
123011670649
1345175059734
14722800955745
1512287616247664
16221177092457953
174202364756701106
1884047295134022121
191764993197814464540
2038829850351918219881
21893086558094119057262

[0,1,4,25,174,1393,12536,125361,1378970,16547641,
 215119332,3011670649,45175059734,722800955745,
 12287616247664,221177092457953,4202364756701106,
 84047295134022121,1764993197814464540,
 38829850351918219881,893086558094119057262]