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A181928 as a simple table

na(n)
11680
26720
315120
426880
542000
660480
782320
8107520
9136080
10168000
11203280
12221760
13241920
14283920
15329280
16378000
17430080
18485520
19544320
20606480
21672000
22740880
23813120
24887040
25888720
26967680
271050000
281135680
291224720

[1680,6720,15120,26880,42000,60480,82320,107520,
 136080,168000,203280,221760,241920,283920,329280,
 378000,430080,485520,544320,606480,672000,740880,
 813120,887040,888720,967680,1050000,1135680,
 1224720]