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A282227 as a simple table

na(n)
10
20
3240
49506
5329630
610549476
7322266792
89542402912
9276273058272
107864096497640
11220899600335616
126139162615626000
13169129648593328224
144625418051157950944
15125714397554778912064
163398615150805414408480

[0,0,240,9506,329630,10549476,322266792,
 9542402912,276273058272,7864096497640,
 220899600335616,6139162615626000,
 169129648593328224,4625418051157950944,
 125714397554778912064,3398615150805414408480]