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A111877 as a simple table

na(n)
01
15
235
3105
41155
515015
615015
7255255
84849845
94849845
10111546435
11557732175
121673196525
1348522699225
141504203675975
151504203675975
161504203675975
1755655536011075
1855655536011075
192281876976454075
2098120709987525225

[1,5,35,105,1155,15015,15015,255255,4849845,
 4849845,111546435,557732175,1673196525,
 48522699225,1504203675975,1504203675975,
 1504203675975,55655536011075,55655536011075,
 2281876976454075,98120709987525225]