login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A093904
as a simple table
n
a(n)
1
0
2
1
3
4
4
17
5
84
6
485
7
3236
8
24609
9
210572
10
2004749
11
21033900
12
241237001
[0,1,4,17,84,485,3236,24609,210572,2004749, 21033900,241237001]