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A127531 as a simple table

na(n)
10
20
32
413
564
6285
71210
85005
920384
1082212
11329460
121314610
135230016
1420764055
1582317690
16326012925
171290244800
185103910680
1920183646780
2079802261190
21315492902400
221247247742650
234930910180196
2419495286167698
2577085553829824

[0,0,2,13,64,285,1210,5005,20384,82212,329460,
 1314610,5230016,20764055,82317690,326012925,
 1290244800,5103910680,20183646780,79802261190,
 315492902400,1247247742650,4930910180196,
 19495286167698,77085553829824]