login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A252784
as a simple table
n
a(n)
0
0
1
0
2
1
3
3
4
7
5
22
6
89
7
779
8
30078
9
8785772
10
48803495722
11
1774274116992170
[0,0,1,3,7,22,89,779,30078,8785772,48803495722, 1774274116992170]