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A007859
as a simple table
n
a(n)
1
0
2
1
3
4
4
18
5
84
6
405
7
2002
8
10101
9
51844
10
269994
11
1423784
12
7590044
13
40846390
14
221650195
15
1211606190
[0,1,4,18,84,405,2002,10101,51844,269994,1423784, 7590044,40846390,221650195,1211606190]
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Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)
