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A210424 as a simple table

na(n)
10
20
36
440
5186
6816
73396
814040
957306
10233000
11943608
123813000
1315378716
1461946640
15249260316
161002158880
174026527706
1816169288640
1964901712996
20260410648680
211044535993800
224188615723280
2316792541033556
2467309233561240
25269746851976156

[0,0,6,40,186,816,3396,14040,57306,233000,943608,
 3813000,15378716,61946640,249260316,1002158880,
 4026527706,16169288640,64901712996,260410648680,
 1044535993800,4188615723280,16792541033556,
 67309233561240,269746851976156]