login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A243785
as a simple table
n
a(n)
1
0
2
0
3
1
4
4
5
12
6
56
7
267
8
1605
9
11909
10
109525
[0,0,1,4,12,56,267,1605,11909,109525]