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A238691 as a simple table

na(n)
01
12
23
315
415
521
61155
7165
82145
951051
10255255
11440895
12440895
13969
14111435
15248834355
16248834355
172927463
185898837945
1944352165
201641030105
218563193457
2242815967285
2380047243185
241360803134145
2532898537309
267731156267615
271028243783592795
281028243783592795
29375840831244263

[1,2,3,15,15,21,1155,165,2145,51051,255255,440895,
 440895,969,111435,248834355,248834355,2927463,
 5898837945,44352165,1641030105,8563193457,
 42815967285,80047243185,1360803134145,32898537309,
 7731156267615,1028243783592795,1028243783592795,
 375840831244263]