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A081405 as a simple table

na(n)
01
11
23
34
415
524
6105
7192
8945
91920
1010395
1123040
12135135
13322560
142027025
155160960
1634459425
1792897280
18654729075
191857945600
2013749310575
2140874803200
22316234143225
23980995276800
247905853580625
2525505877196800
26213458046676875

[1,1,3,4,15,24,105,192,945,1920,10395,23040,
 135135,322560,2027025,5160960,34459425,92897280,
 654729075,1857945600,13749310575,40874803200,
 316234143225,980995276800,7905853580625,
 25505877196800,213458046676875]