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A237494 as a simple table

na(n)
1256
21728
31728
411960
519288
611960
784000
8221512
9221512
1084000
11589944
122584128
134248736
142584128
15589944
164135648
1730171224
1882919944
1982919944
2030171224
214135648
2228986208
23351706460
241621147104
252719193212
261621147104

[256,1728,1728,11960,19288,11960,84000,221512,
 221512,84000,589944,2584128,4248736,2584128,
 589944,4135648,30171224,82919944,82919944,
 30171224,4135648,28986208,351706460,1621147104,
 2719193212,1621147104]