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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.

A226000 Number of pairs of orthogonal (-2,7) vectors of length 9*n.

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%I A226000 #9 Sep 06 2013 02:02:45
%S A226000 2376,473173920,142896990300480,20278050662801226240,
%T A226000 3273835406669841316064256,637732143080315479532514447360,
%U A226000 115448330868966954716300528059883520
%N A226000 Number of pairs of orthogonal (-2,7) vectors of length 9*n.
%C A226000 Row 14 of A225987.
%H A226000 R. H. Hardin, <a href="/A226000/b226000.txt">Table of n, a(n) for n = 1..46</a>
%e A226000 Some solutions for n=1
%e A226000 .-2..7...-2..7...-2..7...-2..7...-2..7...-2..7....7..7...-2..7...-2..7....7..7
%e A226000 ..7.-2....7.-2....7.-2....7..7....7..7....7..7...-2..7....7.-2...-2..7...-2..7
%e A226000 .-2..7...-2..7....7..7...-2..7...-2..7...-2..7....7.-2....7..7....7..7...-2..7
%e A226000 ..7..7....7..7...-2..7...-2..7....7.-2....7.-2....7..7...-2..7...-2..7....7.-2
%e A226000 .-2..7....7.-2...-2..7...-2..7....7.-2....7..7...-2..7....7.-2....7.-2...-2..7
%e A226000 ..7..7...-2..7....7..7...-2..7...-2..7....7.-2...-2..7....7..7...-2..7....7..7
%e A226000 ..7.-2....7.-2...-2..7...-2..7....7.-2....7.-2....7.-2....7.-2...-2..7...-2..7
%e A226000 .-2..7....7..7....7.-2....7..7....7..7...-2..7...-2..7....7.-2...-2..7...-2..7
%e A226000 .-2..7...-2..7....7.-2...-2..7...-2..7...-2..7....7.-2....7.-2....7..7...-2..7
%K A226000 nonn
%O A226000 1,1
%A A226000 _R. H. Hardin_, May 22 2013

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