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A156289 as a simple table

na(n)
11
21
33
41
515
615
71
863
9210
10105
111
12255
132205
143150
15945
161
171023
1821120
1965835
2051975
2110395
221
234095
24195195
251201200
261891890
27945945
28135135
291
3016383
311777230
3220585565
3358108050
3454864810
3518918900
362027025
371
3865535
3916076985

[1,1,3,1,15,15,1,63,210,105,1,255,2205,3150,945,1,
 1023,21120,65835,51975,10395,1,4095,195195,
 1201200,1891890,945945,135135,1,16383,1777230,
 20585565,58108050,54864810,18918900,2027025,1,
 65535,16076985]