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A143703 as a simple table

na(n)
11
23
37
415
515
621
715
839
991
10555
11285
12915
133333
141155
151267
162769
174935
1810005
1970635
207035
21240045
2277745
23167055
24897429
251231635
261066065
271174695

[1,3,7,15,15,21,15,39,91,555,285,915,3333,1155,
 1267,2769,4935,10005,70635,7035,240045,77745,
 167055,897429,1231635,1066065,1174695]