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A059903 as a simple table

n a(n)
0 1
1 4
2 18
3 1
4 16
5 324
6 72030
7 162
8 1
9 64
10 5832
11 2916
12 372027810
13 10588410
14 1458
15 1
16 256
17 104976
18 1036385881030500
19 26244
20 9421689827550
21 4946387159463750
22 1556496270
23 13122
24 1
25 1024
26 1889568
27 2542277241000
28 76256028326940
29 236196

[1,4,18,1,16,324,72030,162,1,64,5832,2916,
 372027810,10588410,1458,1,256,104976,
 1036385881030500,26244,9421689827550,
 4946387159463750,1556496270,13122,1,1024,1889568,
 2542277241000,76256028326940,236196]

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Last modified September 25 12:18 EDT 2020. Contains 337343 sequences. (Running on oeis4.)