A226003 - OEIS

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A226003

Number of pairs of orthogonal (-5,7) vectors of length 12*n.

63360, 4403255070720, 50389229527931289600, 691039017279131756475187200, 11230803011407677754405600949698560, 162663217362852128754854119225357687062528

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Row 17 of A225987.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..36

EXAMPLE

Some solutions for n=1

..7..7....7..7...-5.-5...-5..7...-5..7...-5..7...-5..7...-5.-5...-5..7....7..7

.-5..7...-5..7...-5.-5....7..7....7.-5....7..7....7..7...-5.-5....7..7....7..7

.-5..7....7.-5...-5..7....7..7....7.-5....7..7...-5..7...-5.-5....7.-5...-5..7

.-5..7....7..7...-5.-5....7.-5...-5.-5....7.-5...-5..7...-5.-5....7..7....7.-5

.-5..7....7.-5...-5.-5...-5..7...-5..7...-5..7....7..7...-5..7...-5..7....7..7

..7.-5....7..7....7.-5...-5..7...-5.-5...-5..7...-5..7...-5..7....7..7...-5..7

..7..7....7..7....7.-5....7..7...-5.-5...-5..7...-5..7...-5.-5....7.-5....7.-5

.-5..7....7.-5...-5.-5...-5..7...-5.-5....7.-5....7..7...-5.-5...-5..7...-5..7

..7..7...-5..7....7.-5....7.-5...-5.-5....7..7....7..7...-5.-5....7.-5....7.-5

.-5..7....7..7....7.-5....7..7...-5.-5....7..7...-5..7....7.-5....7..7....7..7

..7..7....7.-5...-5.-5....7.-5...-5..7....7..7....7..7....7.-5....7.-5...-5..7

..7..7....7.-5...-5.-5....7..7...-5.-5...-5..7....7.-5....7.-5....7..7....7..7

CROSSREFS

Sequence in context: A230681 A209793 A115748 * A203921 A237918 A294147

Adjacent sequences: A226000 A226001 A226002 * A226004 A226005 A226006

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 22 2013

STATUS

approved