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A225997 Number of pairs of orthogonal (-1,6) vectors of length 7*n. 1
231, 1724086, 23850799560, 182201755171800, 1431877318884329856, 13044657178246280571712, 116927857061958334999652864, 1034834452512042254405345443200, 9329147292031736106743104217184000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 11 of A225987.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..67

EXAMPLE

Some solutions for n=1

.-1..6...-1..6...-1..6...-1.-1....6..6...-1..6...-1..6...-1..6...-1..6...-1..6

..6..6....6.-1...-1..6...-1.-1...-1..6...-1..6...-1..6...-1..6....6.-1....6.-1

.-1..6....6.-1....6..6...-1.-1...-1..6....6.-1...-1..6....6..6....6..6...-1..6

..6.-1...-1..6....6.-1...-1..6....6.-1....6..6....6..6...-1..6...-1..6...-1..6

..6.-1...-1..6....6.-1...-1.-1...-1..6...-1..6....6.-1...-1..6...-1..6...-1..6

..6.-1....6..6....6.-1...-1.-1....6.-1...-1..6....6.-1....6.-1...-1..6....6..6

..6.-1...-1..6....6.-1...-1.-1...-1..6...-1..6....6.-1....6.-1...-1..6....6.-1

CROSSREFS

Sequence in context: A027551 A172861 A068750 * A172898 A172908 A172935

Adjacent sequences:  A225994 A225995 A225996 * A225998 A225999 A226000

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 22 2013

STATUS

approved

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Last modified August 13 14:01 EDT 2022. Contains 356091 sequences. (Running on oeis4.)