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A109319 as a simple table

na(n)
01
12
25
315
455
5235
61119
75775
831663
9182087
101087927
116706823
1242433735
13274403575
141807700679
1512099813111
1682113733447
17563992581079
183914861387495
1927429176467703
20193781828188615
211379223584026967

[1,2,5,15,55,235,1119,5775,31663,182087,1087927,
 6706823,42433735,274403575,1807700679,12099813111,
 82113733447,563992581079,3914861387495,
 27429176467703,193781828188615,1379223584026967]