login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A103465
as a simple table
n
a(n)
1
1
2
1
3
2
4
7
5
25
6
118
7
551
8
2812
9
14445
10
76092
11
403976
12
2167116
13
11698961
14
63544050
15
346821209
16
1901232614
[1,1,2,7,25,118,551,2812,14445,76092,403976, 2167116,11698961,63544050,346821209,1901232614]