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A178293 as a simple table

na(n)
10
20
30
44907776
5250334405
64432154880
783634563315
8797134274560
95623659900846
1041662871239680
11222405745759290
12917018531400960
134294168964874715
1416067910057871616
1550983015079601525

[0,0,0,4907776,250334405,4432154880,83634563315,
 797134274560,5623659900846,41662871239680,
 222405745759290,917018531400960,4294168964874715,
 16067910057871616,50983015079601525]