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A055790 as a simple table

n a(n)
0 0
1 2
2 4
3 14
4 64
5 362
6 2428
7 18806
8 165016
9 1616786
10 17487988
11 206918942
12 2657907184
13 36828901754
14 547499510764
15 8691268384262
16 146725287298888
17 2624698909845026
18 49592184973992676
19 986871395973226286
20 20630087248996393888
21 451982388752415571082

[0,2,4,14,64,362,2428,18806,165016,1616786,
 17487988,206918942,2657907184,36828901754,
 547499510764,8691268384262,146725287298888,
 2624698909845026,49592184973992676,
 986871395973226286,20630087248996393888,
 451982388752415571082]

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Last modified January 19 06:37 EST 2020. Contains 331033 sequences. (Running on oeis4.)