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A000155 as a simple table

n a(n)
0 0
1 1
2 2
3 7
4 44
5 361
6 3654
7 44207
8 622552
9 10005041
10 180713290
11 3624270839
12 79914671748
13 1921576392793
14 50040900884366
15 1403066801155039
16 42142044935535536
17 1349948504738292193
18 45940391206037470098 

[0,1,2,7,44,361,3654,44207,622552,10005041,
 180713290,3624270839,79914671748,1921576392793,
 50040900884366,1403066801155039,42142044935535536,
 1349948504738292193,45940391206037470098]

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Last modified April 18 18:58 EDT 2024. Contains 371781 sequences. (Running on oeis4.)