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A028684 as a simple table

na(n)
01
1462
2108002664
312244181663697984
4671907296255880840847211520
517845802448787704188422900898268569763840
6229407835408995110669430829173445733902175228551055278080

[1,462,108002664,12244181663697984,
 671907296255880840847211520,
 17845802448787704188422900898268569763840,
 22940783540899511066943082917344573390217522855105\
 5278080]