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A226004 Number of pairs of orthogonal (-6,7) vectors of length 13*n. 1
164736, 73201966489600, 2521184924824165416960, 178483804896209887617477509120, 10141070492754733571346654771749584896, 628258815066107432786230672181689099642470400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 18 of A225987.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..31

EXAMPLE

Some solutions for n=1

.-6..7...-6.-6...-6..7...-6.-6...-6..7...-6.-6...-6..7...-6..7...-6..7...-6.-6

..7.-6...-6..7...-6..7...-6.-6...-6..7...-6.-6...-6..7...-6.-6...-6..7...-6..7

..7..7....7.-6....7..7...-6..7...-6..7...-6.-6...-6.-6....7.-6....7..7...-6.-6

..7..7...-6.-6....7..7....7.-6....7..7...-6..7...-6.-6...-6.-6....7..7...-6.-6

.-6..7...-6.-6....7..7...-6..7....7.-6...-6.-6...-6.-6...-6..7....7.-6...-6..7

..7..7...-6..7....7.-6....7.-6....7..7...-6.-6...-6..7...-6..7....7..7....7.-6

..7..7...-6..7....7..7...-6.-6...-6..7...-6..7...-6.-6...-6.-6....7..7...-6.-6

.-6..7...-6.-6...-6..7...-6.-6....7.-6....7.-6....7.-6...-6..7....7..7...-6.-6

..7..7...-6.-6...-6..7...-6.-6....7..7....7.-6...-6.-6...-6..7...-6..7...-6.-6

.-6..7...-6..7....7.-6...-6.-6....7..7...-6.-6....7.-6...-6.-6...-6..7....7.-6

..7.-6...-6.-6....7..7....7.-6....7..7...-6..7...-6.-6...-6.-6....7.-6...-6.-6

..7..7...-6.-6...-6..7...-6.-6....7.-6...-6.-6...-6..7...-6.-6...-6..7...-6..7

..7.-6....7.-6....7..7....7.-6....7..7...-6..7...-6.-6...-6.-6....7..7....7.-6

CROSSREFS

Sequence in context: A196675 A034603 A234680 * A233705 A233706 A233701

Adjacent sequences:  A226001 A226002 A226003 * A226005 A226006 A226007

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 22 2013

STATUS

approved

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Last modified May 23 03:15 EDT 2022. Contains 353959 sequences. (Running on oeis4.)