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A000831 as a simple table

na(n)
01
12
24
316
480
5512
63904
734816
8354560
94063232
1051733504
11724566016
1211070525440
13183240753152
143266330312704
1562382319599616
161270842139934720
1727507470234550272
18630424777638805504
1915250953398036463616
20388362339077351014400
2110384044045105304174592

[1,2,4,16,80,512,3904,34816,354560,4063232,
 51733504,724566016,11070525440,183240753152,
 3266330312704,62382319599616,1270842139934720,
 27507470234550272,630424777638805504,
 15250953398036463616,388362339077351014400,
 10384044045105304174592]