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A067476 as a simple table

na(n)
264
3625
46084
560025
6600625
76002500
860000516
9600005025
106000051600
1160000012601
12600000512409
136000001260100
1460000004765089
15600000028030404
166000000011750889
1760000000353550625
18600000001175088900

[64,625,6084,60025,600625,6002500,60000516,
 600005025,6000051600,60000012601,600000512409,
 6000001260100,60000004765089,600000028030404,
 6000000011750889,60000000353550625,
 600000001175088900]