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A013958 as a simple table

na(n)
11
21025
359050
41049601
59765626
660526250
7282475250
81074791425
93486843451
1010009766650
1125937424602
1261978939050
13137858491850
14289537131250
15576660215300
161100586419201
172015993900450
183574014537275
196131066257802
2010250010815226
2116680163512500
2226585860217050

[1,1025,59050,1049601,9765626,60526250,282475250,
 1074791425,3486843451,10009766650,25937424602,
 61978939050,137858491850,289537131250,
 576660215300,1100586419201,2015993900450,
 3574014537275,6131066257802,10250010815226,
 16680163512500,26585860217050]