login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A173017
as a simple table
n
a(n)
2
1
3
4
4
7
5
19
6
25
7
56
8
73
9
144
10
180
11
346
12
430
13
826
[1,4,7,19,25,56,73,144,180,346,430,826]