login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A006927
as a simple table
n
a(n)
0
0
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
0
9
0
10
0
11
0
12
1
13
3
14
21
15
545
16
30368
17
1782839
18
95079080
19
4686063107
[0,0,0,0,0,0,0,0,0,0,0,0,1,3,21,545,30368,1782839, 95079080,4686063107]