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A248990 as a simple table

na(n)
12
253
3204
4585
52042
66065
712644
824583
940878
1072399
11115668
12180421
13260514
14371185
15521910
16723925
17962888
181263913
191604166
202067027
212592298
223230455
233942088
244781303
255766434
266934955
278208132
289682923
2911277354
3013209205

[2,53,204,585,2042,6065,12644,24583,40878,72399,
 115668,180421,260514,371185,521910,723925,962888,
 1263913,1604166,2067027,2592298,3230455,3942088,
 4781303,5766434,6934955,8208132,9682923,11277354,
 13209205]