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A140393 as a simple table

na(n)
11
20
30
42
510
64
740
892
9352
10724
112680
1214200
1373712
14365596
152279184
1614772512
1795815104
18666090624
194968057848
2039029188884
21314666222712
222691008701644
2324233937684440
24226732487925864

[1,0,0,2,10,4,40,92,352,724,2680,14200,73712,
 365596,2279184,14772512,95815104,666090624,
 4968057848,39029188884,314666222712,2691008701644,
 24233937684440,226732487925864]