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A002426 as a simple table

n a(n)
0 1
1 1
2 3
3 7
4 19
5 51
6 141
7 393
8 1107
9 3139
10 8953
11 25653
12 73789
13 212941
14 616227
15 1787607
16 5196627
17 15134931
18 44152809
19 128996853
20 377379369
21 1105350729
22 3241135527
23 9513228123
24 27948336381
25 82176836301
26 241813226151
27 712070156203
28 2098240353907
29 6186675630819

[1,1,3,7,19,51,141,393,1107,3139,8953,25653,73789,
 212941,616227,1787607,5196627,15134931,44152809,
 128996853,377379369,1105350729,3241135527,
 9513228123,27948336381,82176836301,241813226151,
 712070156203,2098240353907,6186675630819]

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Last modified August 21 21:42 EDT 2018. Contains 313957 sequences. (Running on oeis4.)