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A063481 as a simple table

na(n)
02
112
280
3576
44352
533792
6266240
72113536
816842752
9134479872
101074790400
118594128896
1268736253952
13549822922752
144398314946560
1535185445830656
16281479271677952
172251816993554432
1818014467228958720
19144115462953762816

[2,12,80,576,4352,33792,266240,2113536,16842752,
 134479872,1074790400,8594128896,68736253952,
 549822922752,4398314946560,35185445830656,
 281479271677952,2251816993554432,
 18014467228958720,144115462953762816]