login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A086879 Number of symmetric singular n X n matrices over GF(2). 1
1, 4, 36, 576, 18880, 1208320, 155553792, 39821770752, 20417644331008, 20907667794952192, 42834024773286100992, 175448165471379869663232, 1437398154830976169705209856, 23550331368750713564450158280704 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..14.

FORMULA

a(n) = 2^(n*(n+1)/2) - A086812(n).

CROSSREFS

Cf. A086812.

Sequence in context: A073852 A139033 A001044 * A002761 A002084 A135867

Adjacent sequences:  A086876 A086877 A086878 * A086880 A086881 A086882

KEYWORD

nonn

AUTHOR

Yuval Dekel (dekelyuval(AT)hotmail.com), Sep 16 2003

EXTENSIONS

More terms from Ray Chandler, Sep 19 2003

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified May 22 16:15 EDT 2013. Contains 225553 sequences.