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A022491 as a simple table

na(n)
10
21
32
46
518
672
7321
81680
99852
1064168
11457659
123543785
1329578097
14264623046
152525897073
1625622275565
17275257714175
183122190896616
1937290114445901
20467812869356846

[0,1,2,6,18,72,321,1680,9852,64168,457659,3543785,
 29578097,264623046,2525897073,25622275565,
 275257714175,3122190896616,37290114445901,
 467812869356846]