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A180390 as a simple table

na(n)
10
20
32
48
546
6348
72556
821568
9207226
102139108
1124243696
12299757088
133981465548
1456839765304

[0,0,2,8,46,348,2556,21568,207226,2139108,
 24243696,299757088,3981465548,56839765304]