login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A064227
as a simple table
n
a(n)
1
0
2
1
3
4
4
131
5
99734
6
181653
7
328002
8
325374625245
9
394178473633984
[0,1,4,131,99734,181653,328002,325374625245, 394178473633984]