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A028682 as a simple table

na(n)
01
1380
260648000
33880986816000000
499352641531709440000000000
51017370731356251764129792000000000000000
64167150450523480419075515127693312000000000000000000000

[1,380,60648000,3880986816000000,
 99352641531709440000000000,
 1017370731356251764129792000000000000000,
 41671504505234804190755151276933120000000000000000\
 00000]