login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A226002 Number of pairs of orthogonal (-4,7) vectors of length 11*n. 1

%I #8 Sep 06 2013 02:02:31

%S 23760,241040067840,927160196029562880,2606734186332708640980992,

%T 10726454782976061347559450869760,

%U 39254958066409241851311669665794621440,146612881747544901468330072567145716462387200

%N Number of pairs of orthogonal (-4,7) vectors of length 11*n.

%C Row 16 of A225987.

%H R. H. Hardin, <a href="/A226002/b226002.txt">Table of n, a(n) for n = 1..40</a>

%e Some solutions for n=1

%e .-4..7...-4..7....7..7...-4..7....7..7....7..7....7..7...-4..7....7..7....7..7

%e ..7.-4...-4..7...-4..7....7.-4...-4..7...-4..7...-4..7...-4..7...-4..7...-4..7

%e .-4..7...-4..7....7.-4....7.-4....7..7....7.-4....7..7....7..7...-4..7....7..7

%e ..7..7...-4..7....7..7....7..7...-4..7...-4..7....7.-4....7..7....7..7....7.-4

%e ..7..7....7..7....7..7....7.-4...-4..7....7..7....7..7....7..7....7..7...-4..7

%e .-4..7...-4..7...-4..7....7..7....7..7....7..7...-4..7....7..7....7.-4...-4..7

%e ..7.-4....7..7...-4..7....7..7....7.-4....7..7....7.-4...-4..7...-4..7...-4..7

%e ..7..7...-4..7....7..7....7.-4....7.-4...-4..7....7..7....7.-4...-4..7...-4..7

%e ..7.-4....7..7....7.-4...-4..7....7..7...-4..7....7.-4...-4..7....7.-4....7..7

%e ..7..7....7.-4...-4..7....7..7...-4..7....7.-4....7.-4....7.-4...-4..7...-4..7

%e ..7.-4....7..7...-4..7....7.-4...-4..7...-4..7....7.-4....7.-4....7..7....7..7

%K nonn

%O 1,1

%A _R. H. Hardin_, May 22 2013

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 April 18 21:46 EDT 2024. Contains 371781 sequences. (Running on oeis4.)