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A189154 as a simple table

na(n)
14
216
364
4225
5784
62704
79216
831329
9106276
10360000
111218816
124124961
1313957696
1447224384
15159769600
16540516001
171828588644
186186137104
1920927672896
2070798034241
21239508444816
22810252019600
232741064339456
249272956793409

[4,16,64,225,784,2704,9216,31329,106276,360000,
 1218816,4124961,13957696,47224384,159769600,
 540516001,1828588644,6186137104,20927672896,
 70798034241,239508444816,810252019600,
 2741064339456,9272956793409]