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A000828 as a simple table

na(n)
01
11
22
38
440
5256
61952
717408
8177280
92031616
1025866752
11362283008
125535262720
1391620376576
141633165156352
1531191159799808
16635421069967360
1713753735117275136
18315212388819402752
197625476699018231808

[1,1,2,8,40,256,1952,17408,177280,2031616,
 25866752,362283008,5535262720,91620376576,
 1633165156352,31191159799808,635421069967360,
 13753735117275136,315212388819402752,
 7625476699018231808]