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A247727 as a simple table

na(n)
18
248
3168
4440
5960
61848
73248
85328
98280
1012320
1117688
1224648
1333488
1444520
1558080
1674528
1794248
18117648
19145160
20177240
21214368
22257048
23305808
24361200
25423800
26494208
27573048
28660968
29758640
30866760
31986048
321117248
331261128

[8,48,168,440,960,1848,3248,5328,8280,12320,17688,
 24648,33488,44520,58080,74528,94248,117648,145160,
 177240,214368,257048,305808,361200,423800,494208,
 573048,660968,758640,866760,986048,1117248,
 1261128]