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A180974 as a simple table

na(n)
13750
275000
3150000
4232500
5241875
6326625
7337500
8450000
9585000
10749250
11768750
12975000
131230000
141546500
151584375
161940325
171987500
182490000
193117000
203899850
213993750
224995000
236246000
247809300
257996875
269763065
279997500

[3750,75000,150000,232500,241875,326625,337500,
 450000,585000,749250,768750,975000,1230000,
 1546500,1584375,1940325,1987500,2490000,3117000,
 3899850,3993750,4995000,6246000,7809300,7996875,
 9763065,9997500]