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A185387 as a simple table

na(n)
01
12
22
33
47
525
6121
7721
85041
940321
10362881
113628801
1239916801
13479001601
146227020801
1587178291201
161307674368001
1720922789888001
18355687428096001
196402373705728001

[1,2,2,3,7,25,121,721,5041,40321,362881,3628801,
 39916801,479001601,6227020801,87178291201,
 1307674368001,20922789888001,355687428096001,
 6402373705728001]