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A346757 as a simple table

na(n)
20
32
42
512
620
788
8180
9716
101648
116244
1215512
1357188
14149892
15543324
161481636
175310764
184930380
1953102508
20152935148
21540918660
221588618212
235595773136
2416701973552

[0,2,2,12,20,88,180,716,1648,6244,15512,57188,
 149892,543324,1481636,5310764,4930380,53102508,
 152935148,540918660,1588618212,5595773136,
 16701973552]