login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A210426
as a simple table
n
a(n)
1
0
2
0
3
0
4
1
5
44
6
450
7
3175
8
17977
9
91326
10
433434
11
1968268
12
8674028
13
37428470
14
159059732
[0,0,0,1,44,450,3175,17977,91326,433434,1968268, 8674028,37428470,159059732]