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A045499 as a simple table

na(n)
01
11
25
320
485
5400
62046
711226
865676
9407787
102675410
1118475311
12133843405
131014271763
148019687099
1566011609670
16564494701167
175005880952390
1845958055208576
19436161412834300
204273045478169842
2143160044390231165

[1,1,5,20,85,400,2046,11226,65676,407787,2675410,
 18475311,133843405,1014271763,8019687099,
 66011609670,564494701167,5005880952390,
 45958055208576,436161412834300,4273045478169842,
 43160044390231165]