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A177290 as a simple table

na(n)
01
11
26
390
42520
5113400
67484400
7681080400
881729648000
912504636144000
102375880867360000
11367786358267328000
1247683626117839712000

[1,1,6,90,2520,113400,7484400,681080400,
 81729648000,12504636144000,2375880867360000,
 367786358267328000,47683626117839712000]