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A005450 as a simple table

na(n)
12
21
31
47
55
6121
7103
85041
940321
10362881
11329891
1239916801
1336846277
146227020801
1587178291201
161307674368001
171230752346353
18355687428096001
19336967037143579
20121645100408832001
212432902008176640001

[2,1,1,7,5,121,103,5041,40321,362881,329891,
 39916801,36846277,6227020801,87178291201,
 1307674368001,1230752346353,355687428096001,
 336967037143579,121645100408832001,
 2432902008176640001]