login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A090766
as a simple table
n
a(n)
0
1
1
2
2
18
3
1200
4
735000
5
4667544000
6
332086420512000
7
279394363051195392000
[1,2,18,1200,735000,4667544000,332086420512000, 279394363051195392000]