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A203233 as a simple table

na(n)
11
25
321
460
5216
6540
71836
84320
914256
1032400
11104976
12233280
13746496
141632960
155178816
1611197440
1735271936
1875582720
19236825856
20503884800
211572120576
223325639680
2310339716096
2421767823360
2567480252416
26141490851840

[1,5,21,60,216,540,1836,4320,14256,32400,104976,
 233280,746496,1632960,5178816,11197440,35271936,
 75582720,236825856,503884800,1572120576,
 3325639680,10339716096,21767823360,67480252416,
 141490851840]