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A046721 as a simple table

na(n)
21
32
46
516
648
7140
8428
91308
104072
1112796
1240432
13129432
14413900
151342580
164335288
1714201804
1846226896
19152594276
20500016036
211660630740
225472190206
2318264517264
2460475691308
25202684618564
26673892675030
272266436498400
287562707682032
2925510762766704
3085394319699916

[1,2,6,16,48,140,428,1308,4072,12796,40432,129432,
 413900,1342580,4335288,14201804,46226896,
 152594276,500016036,1660630740,5472190206,
 18264517264,60475691308,202684618564,673892675030,
 2266436498400,7562707682032,25510762766704,
 85394319699916]