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A225992 Number of pairs of orthogonal (-3,4) vectors of length 7*n. 1
420, 8168160, 106322711040, 1496349265582080, 22046445329510891520, 329200486775643608186880, 4991630444756812041482665984, 76438688358604087005593563299840, 1179634366672136518672486151133069312 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 6 of A225987.
LINKS
EXAMPLE
Some solutions for n=1
.-3..4...-3..4...-3..4...-3..4....4..4...-3..4....4..4...-3.-3...-3.-3....4..4
.-3..4....4..4...-3.-3....4..4...-3..4....4.-3...-3..4...-3.-3...-3.-3....4..4
.-3..4....4.-3...-3.-3....4..4....4..4....4..4....4..4...-3..4...-3..4...-3..4
..4..4....4..4...-3..4...-3..4...-3..4....4.-3...-3..4...-3..4...-3..4....4.-3
..4.-3....4.-3...-3.-3....4.-3....4.-3...-3..4....4..4....4.-3...-3.-3...-3..4
..4..4...-3..4...-3.-3....4..4....4..4....4..4....4.-3...-3.-3...-3.-3....4..4
..4..4....4..4...-3..4...-3..4....4.-3....4..4...-3..4...-3.-3...-3..4....4.-3
CROSSREFS
Sequence in context: A360537 A046167 A059951 * A028683 A198163 A014890
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 22 2013
STATUS
approved

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Last modified June 12 14:23 EDT 2024. Contains 373331 sequences. (Running on oeis4.)