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 A225999 Number of pairs of orthogonal (-1,7) vectors of length 8*n. 1

%I #8 Sep 06 2013 02:02:48

%S 520,14162160,778340380576,18604134178857920,459346524767252653440,

%T 14452627739116790817780480,429730376813858492544466736640,

%U 12361758128173322901773061686443008

%N Number of pairs of orthogonal (-1,7) vectors of length 8*n.

%C Row 13 of A225987.

%H R. H. Hardin, <a href="/A225999/b225999.txt">Table of n, a(n) for n = 1..58</a>

%e Some solutions for n=1

%e .-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7

%e ..7..7...-1..7....7..7...-1..7...-1..7....7.-1....7.-1....7..7....7..7....7.-1

%e ..7.-1...-1..7...-1..7....7.-1....7.-1....7.-1...-1..7...-1..7...-1..7...-1..7

%e ..7.-1....7.-1...-1..7....7..7....7.-1...-1..7....7..7....7.-1....7.-1....7..7

%e ..7.-1....7.-1...-1..7....7.-1...-1..7....7.-1....7.-1....7.-1....7.-1....7.-1

%e .-1..7....7..7....7.-1....7.-1...-1..7...-1..7...-1..7...-1..7....7.-1...-1..7

%e ..7.-1....7.-1....7.-1...-1..7...-1..7....7.-1....7.-1...-1..7...-1..7...-1..7

%e ..7.-1....7.-1...-1..7....7.-1....7..7....7..7....7.-1...-1..7...-1..7....7.-1

%K nonn

%O 1,1

%A _R. H. Hardin_, May 22 2013

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Last modified September 9 03:06 EDT 2024. Contains 375759 sequences. (Running on oeis4.)