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A031154 as a simple table

n a(n)
1 2
2 5
3 15
4 65
5 235
6 665
7 2132
8 2335
9 6515
10 6665
11 23335
12 47162
13 66515
14 66665
15 67485
16 233335
17 235065
18 666515
19 666665
20 2333335
21 6666515
22 6666665
23 23333335
24 64980962
25 66666515
26 66666665
27 233333335
28 666666515
29 666666665
30 2333333335
31 5044357665

[2,5,15,65,235,665,2132,2335,6515,6665,23335,
 47162,66515,66665,67485,233335,235065,666515,
 666665,2333335,6666515,6666665,23333335,64980962,
 66666515,66666665,233333335,666666515,666666665,
 2333333335,5044357665]

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Last modified September 14 09:19 EDT 2024. Contains 375921 sequences. (Running on oeis4.)