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A217777 as a simple table

na(n)
01
12
24
38
415
530
655
7110
8200
9400
10725
111450
122625
135250
149500
1519000
1634375
1768750
18124375
19248750
20450000
21900000
221628125
233256250
245890625
2511781250
2621312500
2742625000
2877109375
29154218750
30278984375
31557968750
321009375000
332018750000
343651953125

[1,2,4,8,15,30,55,110,200,400,725,1450,2625,5250,
 9500,19000,34375,68750,124375,248750,450000,
 900000,1628125,3256250,5890625,11781250,21312500,
 42625000,77109375,154218750,278984375,557968750,
 1009375000,2018750000,3651953125]