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A186866 as a simple table

na(n)
10
20
32984
468272
5296360
6722384
71335984
82129440
93102752
104255920
115588944
127101824
138794560
1410667152
1512719600
1614951904
1717364064
1819956080
1922727952
2025679680
2128811264
2232122704
2335614000
2439285152
2543136160
2647167024

[0,0,2984,68272,296360,722384,1335984,2129440,
 3102752,4255920,5588944,7101824,8794560,10667152,
 12719600,14951904,17364064,19956080,22727952,
 25679680,28811264,32122704,35614000,39285152,
 43136160,47167024]