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A374872 as a simple table

na(n)
02
18
272
31680
4126000
538811960
661785091368
7616892274180000
845374160012072012000
928175746072918961153889000
10166250736077540332478371155891000
1110349136183590980028259106116944710102320
127466148323412227422384379930251940448396455130000

[2,8,72,1680,126000,38811960,61785091368,
 616892274180000,45374160012072012000,
 28175746072918961153889000,
 166250736077540332478371155891000,
 10349136183590980028259106116944710102320,
 7466148323412227422384379930251940448396455130000]