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A233481 as a simple table

na(n)
00
11
24
321
4144
51245
613140
7164745
82399040
939834585
10742940100
1115374360925
12349484058000
138654336615925
14231842662751700
156679510641428625
16205916703920928000
176762863294018456625
18235719416966063530500
198689887736412502745125

[0,1,4,21,144,1245,13140,164745,2399040,39834585,
 742940100,15374360925,349484058000,8654336615925,
 231842662751700,6679510641428625,
 205916703920928000,6762863294018456625,
 235719416966063530500,8689887736412502745125]