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A373878 as a simple table

na(n)
01
11
225
33360
41336336
51158917760
61870414552161
75024209998931200
820882706457600000000
9126806525870641017811200
101078732544346879404306640625
1112413512011036114072165367296000
12188031682201497672618081000000000000
133661653518107730704646938085472357120000

[1,1,25,3360,1336336,1158917760,1870414552161,
 5024209998931200,20882706457600000000,
 126806525870641017811200,
 1078732544346879404306640625,
 12413512011036114072165367296000,
 188031682201497672618081000000000000,
 3661653518107730704646938085472357120000]