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A281394 as a simple table

na(n)
10
20
36
436
5160
6676
72692
810352
938868
10143276
11520736
121871380
136663484
1423545568
1582661076
16288590204
171002706896
183469289876
1911959062188
2041088781264
21140757051348
22480912678028
231639160372000
245574818816340

[0,0,6,36,160,676,2692,10352,38868,143276,520736,
 1871380,6663484,23545568,82661076,288590204,
 1002706896,3469289876,11959062188,41088781264,
 140757051348,480912678028,1639160372000,
 5574818816340]