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A226003 Number of pairs of orthogonal (-5,7) vectors of length 12*n. 1

%I

%S 63360,4403255070720,50389229527931289600,691039017279131756475187200,

%T 11230803011407677754405600949698560,

%U 162663217362852128754854119225357687062528

%N Number of pairs of orthogonal (-5,7) vectors of length 12*n.

%C Row 17 of A225987.

%H R. H. Hardin, <a href="/A226003/b226003.txt">Table of n, a(n) for n = 1..36</a>

%e Some solutions for n=1

%e ..7..7....7..7...-5.-5...-5..7...-5..7...-5..7...-5..7...-5.-5...-5..7....7..7

%e .-5..7...-5..7...-5.-5....7..7....7.-5....7..7....7..7...-5.-5....7..7....7..7

%e .-5..7....7.-5...-5..7....7..7....7.-5....7..7...-5..7...-5.-5....7.-5...-5..7

%e .-5..7....7..7...-5.-5....7.-5...-5.-5....7.-5...-5..7...-5.-5....7..7....7.-5

%e .-5..7....7.-5...-5.-5...-5..7...-5..7...-5..7....7..7...-5..7...-5..7....7..7

%e ..7.-5....7..7....7.-5...-5..7...-5.-5...-5..7...-5..7...-5..7....7..7...-5..7

%e ..7..7....7..7....7.-5....7..7...-5.-5...-5..7...-5..7...-5.-5....7.-5....7.-5

%e .-5..7....7.-5...-5.-5...-5..7...-5.-5....7.-5....7..7...-5.-5...-5..7...-5..7

%e ..7..7...-5..7....7.-5....7.-5...-5.-5....7..7....7..7...-5.-5....7.-5....7.-5

%e .-5..7....7..7....7.-5....7..7...-5.-5....7..7...-5..7....7.-5....7..7....7..7

%e ..7..7....7.-5...-5.-5....7.-5...-5..7....7..7....7..7....7.-5....7.-5...-5..7

%e ..7..7....7.-5...-5.-5....7..7...-5.-5...-5..7....7.-5....7.-5....7..7....7..7

%K nonn

%O 1,1

%A _R. H. Hardin_, May 22 2013

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Last modified July 1 07:30 EDT 2022. Contains 354952 sequences. (Running on oeis4.)