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A157405 as a simple table

na(n)
01
11
25
31
415
555
61
7105
8220
9935
101
11425
123300
134675
1421505
151
163075
1747850
1884150
19129030
20623645
211
2215855
23415800
242323475
252709630
264365515
27415800
282323475
292709630
304365515
3121827575
321
33123515
346394080
3551934575

[1,1,5,1,15,55,1,105,220,935,1,425,3300,4675,
 21505,1,3075,47850,84150,129030,623645,1,15855,
 415800,2323475,2709630,4365515,415800,2323475,
 2709630,4365515,21827575,1,123515,6394080,
 51934575]