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A237489 as a simple table

na(n)
1256
21728
311960
484000
5589944
64135648
728986208
8203229696
91425235712
109994034688
1170063673600
12491213816320
133444698036992
1424155061404672
15169341502948352
161187245857484800
178325697972232192
1858381830568157184

[256,1728,11960,84000,589944,4135648,28986208,
 203229696,1425235712,9994034688,70063673600,
 491213816320,3444698036992,24155061404672,
 169341502948352,1187245857484800,8325697972232192,
 58381830568157184]