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A041523 as a simple table

na(n)
01
11
23
349
4101
5150
64901
75051
815003
9245099
10505201
11750300
1224514801
1325265101
1475045003
151225985149
162527015301
173753000450
18122623029701
19126376030151
20375375090003
216132377470199
2212640130030401
2318772507500600
24613360370049601
25632132877550201

[1,1,3,49,101,150,4901,5051,15003,245099,505201,
 750300,24514801,25265101,75045003,1225985149,
 2527015301,3753000450,122623029701,126376030151,
 375375090003,6132377470199,12640130030401,
 18772507500600,613360370049601,632132877550201]