login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A188895 Number of n X n (real) {-1,1}-matrices having determinant A003433(n). 1
1, 4, 96, 384, 30720 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..5.

Eric Weisstein's World of Mathematics, Hadamard's Maximum Determinant Problem

Eric Weisstein's World of Mathematics, (-1, 1)-Matrix

CROSSREFS

Cf. A003433.

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

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 8 08:08 EDT 2020. Contains 335520 sequences. (Running on oeis4.)