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A131314 as a simple table

na(n)
10
20
30
40
51
61
721
82576
9982926
10898027452
111704360435624
126105200593277808
1338418707658237401781
14401351360962291322915332
156647604373581920953532817489
16168016310022000683846928851914752
176273885184347679045743431356156590136

[0,0,0,0,1,1,21,2576,982926,898027452,
 1704360435624,6105200593277808,
 38418707658237401781,401351360962291322915332,
 6647604373581920953532817489,
 168016310022000683846928851914752,
 6273885184347679045743431356156590136]