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A151881 as a simple table

na(n)
11
25
323
4120
5724
65012
739332
8345832
93371976
1036135792
11422379792
125349561984
1372996193152
141067779243008
1516670798231040
16276718772067840
174866610479828480
1890401487246167040
191768784607499944960
2036360467544043008000
21783508616506603008000

[1,5,23,120,724,5012,39332,345832,3371976,
 36135792,422379792,5349561984,72996193152,
 1067779243008,16670798231040,276718772067840,
 4866610479828480,90401487246167040,
 1768784607499944960,36360467544043008000,
 783508616506603008000]