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A052156 as a simple table

n a(n)
0 1
1 1
2 4
3 12
4 36
5 108
6 324
7 972
8 2916
9 8748
10 26244
11 78732
12 236196
13 708588
14 2125764
15 6377292
16 19131876
17 57395628
18 172186884
19 516560652
20 1549681956
21 4649045868
22 13947137604
23 41841412812
24 125524238436
25 376572715308
26 1129718145924

[1,1,4,12,36,108,324,972,2916,8748,26244,78732,
 236196,708588,2125764,6377292,19131876,57395628,
 172186884,516560652,1549681956,4649045868,
 13947137604,41841412812,125524238436,376572715308,
 1129718145924]

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Last modified April 23 18:16 EDT 2024. Contains 371916 sequences. (Running on oeis4.)