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A000417 as a simple table

n a(n)
1 1
2 7
3 28
4 105
5 357
6 1232
7 4067
8 13301
9 42357
10 132845
11 409262
12 1243767
13 3727360
14 11036649
15 32300795
16 93538278
17 268164868
18 761656685
19 2144259516
20 5986658951
21 16583102077
22 45593269265
23 124464561544
24 337479729179
25 909156910290
26 2434121462871
27 6478440788169

[1,7,28,105,357,1232,4067,13301,42357,132845,
 409262,1243767,3727360,11036649,32300795,93538278,
 268164868,761656685,2144259516,5986658951,
 16583102077,45593269265,124464561544,337479729179,
 909156910290,2434121462871,6478440788169]

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Last modified May 30 18:38 EDT 2020. Contains 334728 sequences. (Running on oeis4.)