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A022874 as a simple table

n a(n)
1 2
2 1
3 1
4 2
5 6
6 19
7 60
8 194
9 628
10 2035
11 6597
12 21393
13 69382
14 225031
15 729865
16 2367255
17 7678002
18 24902998
19 80770936
20 261974262
21 849693202
22 2755914018
23 8938593456
24 28991634898
25 94032120191
26 304985891949
27 989198096368

[2,1,1,2,6,19,60,194,628,2035,6597,21393,69382,
 225031,729865,2367255,7678002,24902998,80770936,
 261974262,849693202,2755914018,8938593456,
 28991634898,94032120191,304985891949,989198096368]

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Last modified June 21 19:35 EDT 2024. Contains 373558 sequences. (Running on oeis4.)