login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A211941
as a simple table
n
a(n)
1
4
2
2
3
7
4
13
5
32
6
90
7
189
8
580
9
1347
10
3978
[4,2,7,13,32,90,189,580,1347,3978]