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A081076 as a simple table

na(n)
05
110
250
3325
42210
515130
6103685
7710650
84870850
933385285
10228826130
111568397610
1210749957125
1373681302250
14505019158610
153461452808005
1623725150497410
17162614600673850
181114577054219525
197639424778862810

[5,10,50,325,2210,15130,103685,710650,4870850,
 33385285,228826130,1568397610,10749957125,
 73681302250,505019158610,3461452808005,
 23725150497410,162614600673850,1114577054219525,
 7639424778862810]