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A181967 as a simple table

na(n)
10
20
33
424
5180
61440
712600
8120960
91270080
1014515200
11179625600
122634508800
1337362124800
14566658892800
159807557760000
16167382319104000
173023343138816000
1857621363351552000
191155628453883904000
2025545471085854720000
21587545834974658560000
2213488008733331292160000

[0,0,3,24,180,1440,12600,120960,1270080,14515200,
 179625600,2634508800,37362124800,566658892800,
 9807557760000,167382319104000,3023343138816000,
 57621363351552000,1155628453883904000,
 25545471085854720000,587545834974658560000,
 13488008733331292160000]