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A005017 as a simple table

na(n)
11
21
31
436
5144
6400
73600
82822400
916257024
1032920473600
11823011840000
128129341440000
13292656291840000
143877578804363264
1558642395498086400
16844450495172444160000
1754044831691036426240000
181161740555606493757440000
1976817130615613056614400

[1,1,1,36,144,400,3600,2822400,16257024,
 32920473600,823011840000,8129341440000,
 292656291840000,3877578804363264,
 58642395498086400,844450495172444160000,
 54044831691036426240000,1161740555606493757440000,
 76817130615613056614400]