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A001415 as a simple table

na(n)
01
12
28
360
4320
51980
610512
760788
8320896
91787904
109381840
1151081844
12266680992
131429703548
147432424160
1539409195740
16204150606976
171073644675448
185545305620064

[1,2,8,60,320,1980,10512,60788,320896,1787904,
 9381840,51081844,266680992,1429703548,7432424160,
 39409195740,204150606976,1073644675448,
 5545305620064]