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A186864 as a simple table

na(n)
10
20
31208
46712
517280
632520
752432
877016
9106272
10140200
11178800
12222072
13270016
14322632
15379920
16441880
17508512
18579816
19655792
20736440
21821760
22911752
231006416
241105752
251209760
261318440
271431792
281549816
291672512
301799880
311931920

[0,0,1208,6712,17280,32520,52432,77016,106272,
 140200,178800,222072,270016,322632,379920,441880,
 508512,579816,655792,736440,821760,911752,1006416,
 1105752,1209760,1318440,1431792,1549816,1672512,
 1799880,1931920]