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A226001 Number of pairs of orthogonal (-3,7) vectors of length 10*n. 2
8160, 11670170880, 13816736416550400, 8837797610915077242880, 7704457212444839067088322560, 7041012236359757418211467425218560, 6005570486226633002683450297283300556800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 15 of A225987.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..45

EXAMPLE

Some solutions for n=1

.-3..7...-3..7...-3..7....7..7....7..7...-3..7....7..7...-3..7...-3.-3....7..7

.-3..7....7.-3....7.-3...-3..7...-3..7....7..7...-3..7...-3..7...-3..7...-3..7

..7.-3....7..7....7.-3....7..7....7.-3....7.-3...-3..7....7..7...-3.-3....7..7

..7.-3...-3..7...-3..7...-3..7...-3..7...-3..7...-3..7....7..7...-3.-3....7.-3

..7.-3....7.-3...-3..7....7..7....7..7...-3..7....7.-3....7.-3...-3.-3....7.-3

.-3..7...-3..7....7.-3...-3..7...-3..7....7..7....7..7....7.-3...-3..7....7..7

..7..7....7..7....7..7...-3..7....7.-3....7.-3....7.-3...-3..7...-3.-3....7.-3

..7..7...-3..7....7..7....7.-3....7..7....7..7...-3..7....7.-3...-3.-3...-3..7

..7..7...-3..7....7..7...-3..7...-3..7...-3..7....7.-3...-3..7...-3.-3....7.-3

..7.-3....7..7...-3..7....7.-3...-3..7....7.-3....7..7....7..7...-3..7....7.-3

CROSSREFS

Sequence in context: A252914 A230785 A109145 * A096329 A126823 A205092

Adjacent sequences:  A225998 A225999 A226000 * A226002 A226003 A226004

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 22 2013

STATUS

approved

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Last modified January 28 11:10 EST 2022. Contains 350655 sequences. (Running on oeis4.)