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A163228 as a simple table

na(n)
01
18
250
3240
41024
53888
613696
744960
8139970
9414904
101181568
113242928
128623104
1322268752
1456039936
15137686048
16331039232
17780029536
181804321074
194102056144
209177497600
2120225408480
2243948974720
2394236510112
24199549448704

[1,8,50,240,1024,3888,13696,44960,139970,414904,
 1181568,3242928,8623104,22268752,56039936,
 137686048,331039232,780029536,1804321074,
 4102056144,9177497600,20225408480,43948974720,
 94236510112,199549448704]