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A030861 as a simple table

n a(n)
1 2
2 4
3 14
4 58
5 293
6 1761
7 12331
8 98650
9 887855
10 8878555
11 97664108
12 1171969305
13 15235600969
14 213298413570
15 3199476203552
16 51191619256832
17 870257527366148
18 15664635492590668
19 297628074359222695
20 5952561487184453911 

[2,4,14,58,293,1761,12331,98650,887855,8878555,
 97664108,1171969305,15235600969,213298413570,
 3199476203552,51191619256832,870257527366148,
 15664635492590668,297628074359222695,
 5952561487184453911]

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Last modified May 27 23:16 EDT 2024. Contains 372900 sequences. (Running on oeis4.)