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A208742 as a simple table

na(n)
01
12
24
38
416
532
648
772
8108
9162
10243
11405
12675
131125
141875
153125
165000
178000
1812800
1920480
2032768
2153248
2286528
23140608
24228488
25371293
26599781
27968877
281565109
292528253
304084101
316612354
3210705716
3317333064
3428063056
3545435424
3673498480
37118894600

[1,2,4,8,16,32,48,72,108,162,243,405,675,1125,
 1875,3125,5000,8000,12800,20480,32768,53248,86528,
 140608,228488,371293,599781,968877,1565109,
 2528253,4084101,6612354,10705716,17333064,
 28063056,45435424,73498480,118894600]