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A149586 as a simple table

na(n)
01
11
25
315
455
5215
6875
73533
814769
963025
10271061
111171573
125125689
1322634577
14100374805
15446869675
162001901659
179014772611
1840708594111
19184335519819
20837884736507
213821043268147
2217460417237311
2379944561997591
24366975174492475
251688354607241075
267779433515441811
2735898846545834367

[1,1,5,15,55,215,875,3533,14769,63025,271061,
 1171573,5125689,22634577,100374805,446869675,
 2001901659,9014772611,40708594111,184335519819,
 837884736507,3821043268147,17460417237311,
 79944561997591,366975174492475,1688354607241075,
 7779433515441811,35898846545834367]