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A103326 as a simple table

na(n)
15
255
3305
42255
515005
6104005
7709805
84873055
933379505
10228841255
111568358005
1210750060805
1373681030805
14505019869255
153461450947505
1623725155368255
17162614587921805
181114577087604805
197639424691459005
2052361396626646255
21358890349406803505

[5,55,305,2255,15005,104005,709805,4873055,
 33379505,228841255,1568358005,10750060805,
 73681030805,505019869255,3461450947505,
 23725155368255,162614587921805,1114577087604805,
 7639424691459005,52361396626646255,
 358890349406803505]