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A186865 as a simple table

na(n)
10
20
32240
422672
574072
6156484
7268048
8408764
9578632
10777652
111005824
121263148
131549624
141865252
152210032
162583964
172987048
183419284
193880672
204371212
214890904
225439748
236017744
246624892
257261192
267926644
278621248
289345004
2910097912
3010879972
3111691184

[0,0,2240,22672,74072,156484,268048,408764,578632,
 777652,1005824,1263148,1549624,1865252,2210032,
 2583964,2987048,3419284,3880672,4371212,4890904,
 5439748,6017744,6624892,7261192,7926644,8621248,
 9345004,10097912,10879972,11691184]