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A249060 as a simple table

na(n)
01
14
25
324
435
5192
6315
71920
83465
923040
1045045
11322560
12675675
135160960
1411486475
1592897280
16218243025
171857945600
184583103525
1940874803200
20105411381075
21980995276800
222635284526875
2325505877196800
2471152682225625
25714164561510400
262063427784543125

[1,4,5,24,35,192,315,1920,3465,23040,45045,322560,
 675675,5160960,11486475,92897280,218243025,
 1857945600,4583103525,40874803200,105411381075,
 980995276800,2635284526875,25505877196800,
 71152682225625,714164561510400,2063427784543125]