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A055848 as a simple table

na(n)
01
115
2105
3495
41815
55577
615015
736465
881510
9170170
10335478
11629850
121133730
131967070
143304290
155393454
168580495
1713339425
1820309575
1930341025
2044549505
2164382175
2291695825
23128849175
24178811100
25245286756
26332863740
27447180580

[1,15,105,495,1815,5577,15015,36465,81510,170170,
 335478,629850,1133730,1967070,3304290,5393454,
 8580495,13339425,20309575,30341025,44549505,
 64382175,91695825,128849175,178811100,245286756,
 332863740,447180580]