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A225999 Number of pairs of orthogonal (-1,7) vectors of length 8*n. 1
520, 14162160, 778340380576, 18604134178857920, 459346524767252653440, 14452627739116790817780480, 429730376813858492544466736640, 12361758128173322901773061686443008 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 13 of A225987.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..58

EXAMPLE

Some solutions for n=1

.-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7

..7..7...-1..7....7..7...-1..7...-1..7....7.-1....7.-1....7..7....7..7....7.-1

..7.-1...-1..7...-1..7....7.-1....7.-1....7.-1...-1..7...-1..7...-1..7...-1..7

..7.-1....7.-1...-1..7....7..7....7.-1...-1..7....7..7....7.-1....7.-1....7..7

..7.-1....7.-1...-1..7....7.-1...-1..7....7.-1....7.-1....7.-1....7.-1....7.-1

.-1..7....7..7....7.-1....7.-1...-1..7...-1..7...-1..7...-1..7....7.-1...-1..7

..7.-1....7.-1....7.-1...-1..7...-1..7....7.-1....7.-1...-1..7...-1..7...-1..7

..7.-1....7.-1...-1..7....7.-1....7..7....7..7....7.-1...-1..7...-1..7....7.-1

CROSSREFS

Sequence in context: A168220 A293105 A286977 * A291998 A300395 A139663

Adjacent sequences:  A225996 A225997 A225998 * A226000 A226001 A226002

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 22 2013

STATUS

approved

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Last modified May 23 18:08 EDT 2022. Contains 353993 sequences. (Running on oeis4.)