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A230688 as a simple table

na(n)
10
20
30
42
5360
624050
7974548
830543988
9887242598
1025527277010
11725996132762
1220534469030504
13579032138128464
1416301589383840348
15458588230927764470
1612895597377195089490
17362551408586663834792
1810191809036721993234348

[0,0,0,2,360,24050,974548,30543988,887242598,
 25527277010,725996132762,20534469030504,
 579032138128464,16301589383840348,
 458588230927764470,12895597377195089490,
 362551408586663834792,10191809036721993234348]