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A117781 as a simple table

n a(n)
1 3
2 4
3 10
4 10
5 31
6 31
7 126
8 126
9 571
10 571
11 2752
12 2752
13 14248
14 14248
15 73971
16 73971
17 389920
18 389920
19 2108414
20 2108414
21 11512078
22 11512078 

[3,4,10,10,31,31,126,126,571,571,2752,2752,14248,
 14248,73971,73971,389920,389920,2108414,2108414,
 11512078,11512078]

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Last modified June 3 14:28 EDT 2024. Contains 373060 sequences. (Running on oeis4.)