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A291225 as a simple table

na(n)
05
115
240
3100
4236
5535
61175
72515
85270
910846
1021980
1143950
1286850
13169840
14329042
15632135
161205205
172281925
184293270
198030558
2014940700
2127659095
2250968455
2393518940
24170905555
25311159365
26564521620
271020800470
281840124050
293307314163
305927828905

[5,15,40,100,236,535,1175,2515,5270,10846,21980,
 43950,86850,169840,329042,632135,1205205,2281925,
 4293270,8030558,14940700,27659095,50968455,
 93518940,170905555,311159365,564521620,1020800470,
 1840124050,3307314163,5927828905]