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A208939 as a simple table

n a(n)
1 1
2 3
3 6
4 22
5 68
6 264
7 988
8 3954
9 15980
10 66146
11 277190
12 1177152
13 5047672
14 21838420
15 95184446
16 417606390
17 1842715198
18 8172736366
19 36412668752
20 162897497434
21 731442664136 

[1,3,6,22,68,264,988,3954,15980,66146,277190,
 1177152,5047672,21838420,95184446,417606390,
 1842715198,8172736366,36412668752,162897497434,
 731442664136]

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Last modified June 9 03:24 EDT 2024. Contains 373227 sequences. (Running on oeis4.)