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A004527 as a simple table

na(n)
01
11
22
34
412
548
6192
7960
85760
934560
10241920
111935360
1215482880
13139345920
141393459200
1513934592000
16153280512000
171839366144000
1822072393728000
19286941118464000
204017175658496000
2156240459218944000

[1,1,2,4,12,48,192,960,5760,34560,241920,1935360,
 15482880,139345920,1393459200,13934592000,
 153280512000,1839366144000,22072393728000,
 286941118464000,4017175658496000,
 56240459218944000]