login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A188895
Number of n X n (real) {-1,1}-matrices having determinant
A003433
(n).
3
1, 4, 96, 384, 30720, 7372800, 4335206400, 2477260800, 25684239974400, 7191587192832000
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
0,2
LINKS
Table of n, a(n) for n=0..9.
Minfeng Wang,
C++ program to calculate a(2) .. a(5)
Eric Weisstein's World of Mathematics,
Hadamard's Maximum Determinant Problem
Eric Weisstein's World of Mathematics,
(-1, 1)-Matrix
FORMULA
a(n) = 2^(2n+1) *
A051752
(n) for n>=2. -
Hugo Pfoertner
and
Minfeng Wang
, Jan 22 2023
CROSSREFS
Cf.
A003433
,
A051752
.
Sequence in context:
A220682
A210926
A302121
*
A068114
A272109
A203316
Adjacent sequences:
A188892
A188893
A188894
*
A188896
A188897
A188898
KEYWORD
nonn
,
more
,
hard
AUTHOR
Eric W. Weisstein
, Apr 19 2011
EXTENSIONS
Offset changed to 0 by
Hugo Pfoertner
, Jan 23 2023
a(5)-a(9) from
Minfeng Wang
, Jan 22 2023
STATUS
approved
Lookup
|
Welcome
|
Wiki
|
Register
|
Music
|
Plot 2
|
Demos
|
Index
|
Browse
|
More
|
WebCam
Contribute new seq. or comment
|
Format
|
Style Sheet
|
Transforms
|
Superseeker
|
Recents
The OEIS Community
| Maintained by
The OEIS Foundation Inc.
License Agreements, Terms of Use, Privacy Policy.
.
Last modified August 10 09:30 EDT 2024. Contains 375044 sequences. (Running on oeis4.)