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A155857 as a simple table

n a(n)
0 1
1 2
2 6
3 23
4 107
5 590
6 3786
7 27821
8 230869
9 2137978
10 21873854
11 245151555
12 2987967551
13 39358156310
14 557259550034
15 8440866957273
16 136211005966889
17 2333068710452146
18 42276699542130166
19 808068680469402095

[1,2,6,23,107,590,3786,27821,230869,2137978,
 21873854,245151555,2987967551,39358156310,
 557259550034,8440866957273,136211005966889,
 2333068710452146,42276699542130166,
 808068680469402095]

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Last modified March 29 03:51 EDT 2024. Contains 371264 sequences. (Running on oeis4.)