login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A253904
as a simple table
n
a(n)
0
1
1
4
2
504
3
387144514512
4
134785660354544802902690364367892668197456173472
[1,4,504,387144514512, 134785660354544802902690364367892668197456173472]