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A328994 as a simple table

na(n)
11
215
390
4340
5975
62331
74900
89360
916605
1027775
1144286
1267860
13100555
14144795
15203400
16279616
17377145
18500175
19653410
20842100
211072071
221349755
231682220
242077200
252543125
263089151
273725190
284461940
295310915
306284475
317395856
328659200
3310089585

[1,15,90,340,975,2331,4900,9360,16605,27775,44286,
 67860,100555,144795,203400,279616,377145,500175,
 653410,842100,1072071,1349755,1682220,2077200,
 2543125,3089151,3725190,4461940,5310915,6284475,
 7395856,8659200,10089585]