cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A225997 Number of pairs of orthogonal (-1,6) vectors of length 7*n.

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%I A225997 #8 Sep 06 2013 02:02:54
%S A225997 231,1724086,23850799560,182201755171800,1431877318884329856,
%T A225997 13044657178246280571712,116927857061958334999652864,
%U A225997 1034834452512042254405345443200,9329147292031736106743104217184000
%N A225997 Number of pairs of orthogonal (-1,6) vectors of length 7*n.
%C A225997 Row 11 of A225987.
%H A225997 R. H. Hardin, <a href="/A225997/b225997.txt">Table of n, a(n) for n = 1..67</a>
%e A225997 Some solutions for n=1
%e A225997 .-1..6...-1..6...-1..6...-1.-1....6..6...-1..6...-1..6...-1..6...-1..6...-1..6
%e A225997 ..6..6....6.-1...-1..6...-1.-1...-1..6...-1..6...-1..6...-1..6....6.-1....6.-1
%e A225997 .-1..6....6.-1....6..6...-1.-1...-1..6....6.-1...-1..6....6..6....6..6...-1..6
%e A225997 ..6.-1...-1..6....6.-1...-1..6....6.-1....6..6....6..6...-1..6...-1..6...-1..6
%e A225997 ..6.-1...-1..6....6.-1...-1.-1...-1..6...-1..6....6.-1...-1..6...-1..6...-1..6
%e A225997 ..6.-1....6..6....6.-1...-1.-1....6.-1...-1..6....6.-1....6.-1...-1..6....6..6
%e A225997 ..6.-1...-1..6....6.-1...-1.-1...-1..6...-1..6....6.-1....6.-1...-1..6....6.-1
%K A225997 nonn
%O A225997 1,1
%A A225997 _R. H. Hardin_, May 22 2013