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A145620 as a simple table

na(n)
11
22
35
4140
535
6770
75005
840040
9510510
10646646
11323323
1229745716
1314300825
1412257850
1559246275
1629386152400
177346538100
1877138650050
19475688341975
2024735793782700
21253541886272675
2221804602219450050
2310902301109725025

[1,2,5,140,35,770,5005,40040,510510,646646,323323,
 29745716,14300825,12257850,59246275,29386152400,
 7346538100,77138650050,475688341975,
 24735793782700,253541886272675,21804602219450050,
 10902301109725025]