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A216212 as a simple table

na(n)
01
12
24
38
416
530
660
7110
8220
9400
10800
111450
122900
135250
1410500
1519000
1638000
1768750
18137500
19248750
20497500
21900000
221800000
233256250
246512500
2511781250
2623562500
2742625000
2885250000
29154218750
30308437500
31557968750
321115937500
332018750000
344037500000

[1,2,4,8,16,30,60,110,220,400,800,1450,2900,5250,
 10500,19000,38000,68750,137500,248750,497500,
 900000,1800000,3256250,6512500,11781250,23562500,
 42625000,85250000,154218750,308437500,557968750,
 1115937500,2018750000,4037500000]