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A280399 as a simple table

na(n)
10
20
32
42
58
614
736
874
9168
10358
11780
121666
133568
147582
1516084
1633978
1771608
18150486
19315548
20660210
211378688
222873870
235980772
2412427562
2525787208
2653438534
27110605356
28228667234
29472247568
30974321278
312008294900
324135894426

[0,0,2,2,8,14,36,74,168,358,780,1666,3568,7582,
 16084,33978,71608,150486,315548,660210,1378688,
 2873870,5980772,12427562,25787208,53438534,
 110605356,228667234,472247568,974321278,
 2008294900,4135894426]