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A000778 as a simple table

n a(n)
0 1
1 2
2 6
3 18
4 55
5 173
6 560
7 1858
8 6291
9 21657
10 75581
11 266797
12 950911
13 3417339
14 12369284
15 45052514
16 165002459
17 607283489
18 2244901889
19 8331383609
20 31030387439
21 115948830659
22 434542177289
23 1632963760973
24 6151850548775
25 23229299473603
26 87900903988155

[1,2,6,18,55,173,560,1858,6291,21657,75581,266797,
 950911,3417339,12369284,45052514,165002459,
 607283489,2244901889,8331383609,31030387439,
 115948830659,434542177289,1632963760973,
 6151850548775,23229299473603,87900903988155]

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Last modified June 5 16:30 EDT 2020. Contains 334852 sequences. (Running on oeis4.)