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A000391 as a simple table

n a(n)
1 1
2 6
3 21
4 71
5 216
6 672
7 1982
8 5817
9 16582
10 46633
11 128704
12 350665
13 941715
14 2499640
15 6557378
16 17024095
17 43756166
18 111433472
19 281303882
20 704320180
21 1749727370
22 4314842893
23 10565857064
24 25700414815
25 62115621317
26 149214574760
27 356354881511
28 846292135184

[1,6,21,71,216,672,1982,5817,16582,46633,128704,
 350665,941715,2499640,6557378,17024095,43756166,
 111433472,281303882,704320180,1749727370,
 4314842893,10565857064,25700414815,62115621317,
 149214574760,356354881511,846292135184]

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Last modified March 20 05:45 EDT 2019. Contains 321344 sequences. (Running on oeis4.)