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A225992 Number of pairs of orthogonal (-3,4) vectors of length 7*n. 1

%I

%S 420,8168160,106322711040,1496349265582080,22046445329510891520,

%T 329200486775643608186880,4991630444756812041482665984,

%U 76438688358604087005593563299840,1179634366672136518672486151133069312

%N Number of pairs of orthogonal (-3,4) vectors of length 7*n.

%C Row 6 of A225987.

%H R. H. Hardin, <a href="/A225992/b225992.txt">Table of n, a(n) for n = 1..64</a>

%e Some solutions for n=1

%e .-3..4...-3..4...-3..4...-3..4....4..4...-3..4....4..4...-3.-3...-3.-3....4..4

%e .-3..4....4..4...-3.-3....4..4...-3..4....4.-3...-3..4...-3.-3...-3.-3....4..4

%e .-3..4....4.-3...-3.-3....4..4....4..4....4..4....4..4...-3..4...-3..4...-3..4

%e ..4..4....4..4...-3..4...-3..4...-3..4....4.-3...-3..4...-3..4...-3..4....4.-3

%e ..4.-3....4.-3...-3.-3....4.-3....4.-3...-3..4....4..4....4.-3...-3.-3...-3..4

%e ..4..4...-3..4...-3.-3....4..4....4..4....4..4....4.-3...-3.-3...-3.-3....4..4

%e ..4..4....4..4...-3..4...-3..4....4.-3....4..4...-3..4...-3.-3...-3..4....4.-3

%K nonn

%O 1,1

%A _R. H. Hardin_, May 22 2013

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Last modified July 1 06:11 EDT 2022. Contains 354952 sequences. (Running on oeis4.)