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A190051 as a simple table

n a(n)
0 1
1 3
2 12
3 44
4 150
5 482
6 1476
7 4344
8 12368
9 34240
10 92544
11 244992
12 636928
13 1629696
14 4111360
15 10242048
16 25227264
17 61505536
18 148570112
19 355860480
20 845807616
21 1996095488
22 4680056832
23 10906763264
24 25275924480
25 58271465472

[1,3,12,44,150,482,1476,4344,12368,34240,92544,
 244992,636928,1629696,4111360,10242048,25227264,
 61505536,148570112,355860480,845807616,1996095488,
 4680056832,10906763264,25275924480,58271465472]

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Last modified May 12 07:28 EDT 2021. Contains 343821 sequences. (Running on oeis4.)