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A240440 as a simple table

na(n)
10
20
315
4105
5420
61260
73150
86930
913860
1025740
1145045
1275075
13120120
14185640
15278460
16406980
17581400
18813960
191119195
201514205
212018940
222656500
233453450
244440150
255651100
267125300
278906625
2811044215
2913592880
3016613520
3120173560
3224347400
3329216880

[0,0,15,105,420,1260,3150,6930,13860,25740,45045,
 75075,120120,185640,278460,406980,581400,813960,
 1119195,1514205,2018940,2656500,3453450,4440150,
 5651100,7125300,8906625,11044215,13592880,
 16613520,20173560,24347400,29216880]