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A189154 as a simple table

n a(n)
1 4
2 16
3 64
4 225
5 784
6 2704
7 9216
8 31329
9 106276
10 360000
11 1218816
12 4124961
13 13957696
14 47224384
15 159769600
16 540516001
17 1828588644
18 6186137104
19 20927672896
20 70798034241
21 239508444816
22 810252019600
23 2741064339456
24 9272956793409

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

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Last modified April 25 11:06 EDT 2024. Contains 371967 sequences. (Running on oeis4.)