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

1,1

COMMENTS

Row 16 of A225987.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..40

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

Adjacent sequences:  A225999 A226000 A226001 * A226003 A226004 A226005

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 22 2013

STATUS

approved

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Last modified May 20 06:11 EDT 2022. Contains 353852 sequences. (Running on oeis4.)