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A178721 as a simple table

na(n)
10
20
30
40
50
60
740
83192
9119180
102119176
1123636352
12186506000
131131544008
145613017128
1523670094984
1687463182432
17289367715488
18872345119896
192427609997716
206305272324272

[0,0,0,0,0,0,40,3192,119180,2119176,23636352,
 186506000,1131544008,5613017128,23670094984,
 87463182432,289367715488,872345119896,
 2427609997716,6305272324272]