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A288916 as a simple table

na(n)
10
20
3376
44644
523920
681876
7219384
8499544
91014160
101885960
113280968
125402716
138516848
1412929804
1519034408
1627263040
1738165376
1852323744
1970476456
2093380724
21121997440
22157284564
23200461624
24252714168
25315558528
26390435608
27479198872
28583573276
29705791856
30847893292

[0,0,376,4644,23920,81876,219384,499544,1014160,
 1885960,3280968,5402716,8516848,12929804,19034408,
 27263040,38165376,52323744,70476456,93380724,
 121997440,157284564,200461624,252714168,315558528,
 390435608,479198872,583573276,705791856,847893292]