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A283488 as a simple table

na(n)
10
20
32
412
564
6312
71460
86624
929394
10128264
11552384
122353888
139943896
1441703328
15173822258
16720671156
172974187392
1812224902712
1950069348140
20204417445696
21832198630882
223379257614032
2313690075484800
2455344113101440

[0,0,2,12,64,312,1460,6624,29394,128264,552384,
 2353888,9943896,41703328,173822258,720671156,
 2974187392,12224902712,50069348140,204417445696,
 832198630882,3379257614032,13690075484800,
 55344113101440]