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A268358 as a simple table

na(n)
527216
6544320
77212240
881648000
9862774416
108839212480
1189320326480
12897169996800
138988342579216
1489952351128640
15899806333018320
168999216089718400
1789996836576073616
18899987262844420800
198999948800775111760
2089999794450846828800
21899999175545734649616

[27216,544320,7212240,81648000,862774416,
 8839212480,89320326480,897169996800,8988342579216,
 89952351128640,899806333018320,8999216089718400,
 89996836576073616,899987262844420800,
 8999948800775111760,89999794450846828800,
 899999175545734649616]