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A024188 as a simple table

na(n)
11
21
317
442
5654
62712
744568
8264240
94721040
1036694080
11716523840
126917823360
13147356496000
141703866752000
1539427129728000
16531844621056000
1713306234652928000
18205302142854144000
195527796004025344000
2096066041002702848000
212771519306950969344000

[1,1,17,42,654,2712,44568,264240,4721040,36694080,
 716523840,6917823360,147356496000,1703866752000,
 39427129728000,531844621056000,13306234652928000,
 205302142854144000,5527796004025344000,
 96066041002702848000,2771519306950969344000]