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A156831 as a simple table

n a(n)
1 1
2 2
3 6
4 20
5 66
6 188
7 466
8 1022
9 2098
10 4032
11 7342
12 13090
13 22726
14 38824
15 65286
16 108902
17 179762 

[1,2,6,20,66,188,466,1022,2098,4032,7342,13090,
 22726,38824,65286,108902,179762]

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Last modified April 18 18:49 EDT 2024. Contains 371781 sequences. (Running on oeis4.)