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A004304 as a simple table

na(n)
01
12
22
36
428
5160
61036
77294
854548
9426960
103463304
1128910816
12247104976
132154192248
1419097610480
15171769942086
161564484503044
1714407366963440
18133978878618904
191256799271555872
2011881860129979440

[1,2,2,6,28,160,1036,7294,54548,426960,3463304,
 28910816,247104976,2154192248,19097610480,
 171769942086,1564484503044,14407366963440,
 133978878618904,1256799271555872,
 11881860129979440]