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A166468 as a simple table

n a(n)
0 1
1 4
2 12
3 36
4 108
5 324
6 972
7 2916
8 8748
9 26244
10 78732
11 236196
12 708582
13 2125728
14 6377136
15 19131264
16 57393360
17 172178784
18 516532464
19 1549585728
20 4648722192
21 13946061600
22 41837869872
23 125512664832
24 376535160174
25 1129596977628

[1,4,12,36,108,324,972,2916,8748,26244,78732,
 236196,708582,2125728,6377136,19131264,57393360,
 172178784,516532464,1549585728,4648722192,
 13946061600,41837869872,125512664832,376535160174,
 1129596977628]

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Last modified April 12 01:36 EDT 2021. Contains 342912 sequences. (Running on oeis4.)