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A226002
Number of pairs of orthogonal (-4,7) vectors of length 11*n.
1
23760, 241040067840, 927160196029562880, 2606734186332708640980992, 10726454782976061347559450869760, 39254958066409241851311669665794621440, 146612881747544901468330072567145716462387200
OFFSET
1,1
COMMENTS
Row 16 of A225987.
LINKS
EXAMPLE
Some solutions for n=1
.-4..7...-4..7....7..7...-4..7....7..7....7..7....7..7...-4..7....7..7....7..7
..7.-4...-4..7...-4..7....7.-4...-4..7...-4..7...-4..7...-4..7...-4..7...-4..7
.-4..7...-4..7....7.-4....7.-4....7..7....7.-4....7..7....7..7...-4..7....7..7
..7..7...-4..7....7..7....7..7...-4..7...-4..7....7.-4....7..7....7..7....7.-4
..7..7....7..7....7..7....7.-4...-4..7....7..7....7..7....7..7....7..7...-4..7
.-4..7...-4..7...-4..7....7..7....7..7....7..7...-4..7....7..7....7.-4...-4..7
..7.-4....7..7...-4..7....7..7....7.-4....7..7....7.-4...-4..7...-4..7...-4..7
..7..7...-4..7....7..7....7.-4....7.-4...-4..7....7..7....7.-4...-4..7...-4..7
..7.-4....7..7....7.-4...-4..7....7..7...-4..7....7.-4...-4..7....7.-4....7..7
..7..7....7.-4...-4..7....7..7...-4..7....7.-4....7.-4....7.-4...-4..7...-4..7
..7.-4....7..7...-4..7....7.-4...-4..7...-4..7....7.-4....7.-4....7..7....7..7
CROSSREFS
Sequence in context: A344377 A031649 A011254 * A066234 A332313 A237691
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 22 2013
STATUS
approved