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A010683 as a simple table

n a(n)
0 1
1 2
2 7
3 28
4 121
5 550
6 2591
7 12536
8 61921
9 310954
10 1582791
11 8147796
12 42344121
13 221866446
14 1170747519
15 6216189936
16 33186295681
17 178034219986
18 959260792775
19 5188835909516
20 28167068630713
21 153395382655222

[1,2,7,28,121,550,2591,12536,61921,310954,1582791,
 8147796,42344121,221866446,1170747519,6216189936,
 33186295681,178034219986,959260792775,
 5188835909516,28167068630713,153395382655222]

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Last modified February 27 13:18 EST 2020. Contains 332306 sequences. (Running on oeis4.)