cp's OEIS Frontend

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

%I A225999 #8 Sep 06 2013 02:02:48
%S A225999 520,14162160,778340380576,18604134178857920,459346524767252653440,
%T A225999 14452627739116790817780480,429730376813858492544466736640,
%U A225999 12361758128173322901773061686443008
%N A225999 Number of pairs of orthogonal (-1,7) vectors of length 8*n.
%C A225999 Row 13 of A225987.
%H A225999 R. H. Hardin, <a href="/A225999/b225999.txt">Table of n, a(n) for n = 1..58</a>
%e A225999 Some solutions for n=1
%e A225999 .-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7
%e A225999 ..7..7...-1..7....7..7...-1..7...-1..7....7.-1....7.-1....7..7....7..7....7.-1
%e A225999 ..7.-1...-1..7...-1..7....7.-1....7.-1....7.-1...-1..7...-1..7...-1..7...-1..7
%e A225999 ..7.-1....7.-1...-1..7....7..7....7.-1...-1..7....7..7....7.-1....7.-1....7..7
%e A225999 ..7.-1....7.-1...-1..7....7.-1...-1..7....7.-1....7.-1....7.-1....7.-1....7.-1
%e A225999 .-1..7....7..7....7.-1....7.-1...-1..7...-1..7...-1..7...-1..7....7.-1...-1..7
%e A225999 ..7.-1....7.-1....7.-1...-1..7...-1..7....7.-1....7.-1...-1..7...-1..7...-1..7
%e A225999 ..7.-1....7.-1...-1..7....7.-1....7..7....7..7....7.-1...-1..7...-1..7....7.-1
%K A225999 nonn
%O A225999 1,1
%A A225999 _R. H. Hardin_, May 22 2013