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A006220 as a simple table

n a(n)
1 1
2 1
3 3
4 10
5 45
6 251
7 1638
8 12300
9 104877
10 1000135
11 10534062
12 121436206
13 1521332904 

[1,1,3,10,45,251,1638,12300,104877,1000135,
 10534062,121436206,1521332904]

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Last modified April 24 07:15 EDT 2024. Contains 371920 sequences. (Running on oeis4.)