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A157397 as a simple table

na(n)
11
21
35
41
515
645
71
8105
9180
10585
111
12425
132700
142925
159945
161
173075
1834650
1952650
2059670
21208845
221
2315855
24308700
251248975
261253070
271461915
285221125
291
30123515
314475520
3223689575
3333972120
3435085960
3541769000

[1,1,5,1,15,45,1,105,180,585,1,425,2700,2925,9945,
 1,3075,34650,52650,59670,208845,1,15855,308700,
 1248975,1253070,1461915,5221125,1,123515,4475520,
 23689575,33972120,35085960,41769000]