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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 22 2013
STATUS
approved

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Last modified March 29 08:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)