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.
%I A225996 #9 Sep 06 2013 02:02:58 %S A225996 3024,1596291840,294038117867520,68184361565718773760, %T A225996 16084808323123050319970304,3830251318099321155852479496192, %U A225996 931823480133178593246564251905032192 %N A225996 Number of pairs of orthogonal (-4,5) vectors of length 9*n. %C A225996 Row 10 of A225987. %H A225996 R. H. Hardin, <a href="/A225996/b225996.txt">Table of n, a(n) for n = 1..56</a> %e A225996 Some solutions for n=1 %e A225996 ..5..5....5..5...-4..5...-4..5...-4..5...-4..5...-4.-4...-4..5...-4..5...-4..5 %e A225996 .-4..5....5..5...-4..5...-4.-4....5..5...-4..5...-4..5...-4.-4...-4.-4....5..5 %e A225996 .-4..5...-4..5....5..5....5.-4....5.-4....5..5...-4..5...-4.-4...-4.-4...-4..5 %e A225996 ..5..5....5.-4....5..5...-4.-4....5..5...-4..5...-4.-4....5.-4...-4..5...-4..5 %e A225996 ..5.-4....5..5....5.-4...-4..5....5..5...-4..5...-4.-4....5.-4....5.-4...-4..5 %e A225996 .-4..5...-4..5....5..5...-4..5....5.-4....5..5...-4..5...-4.-4...-4.-4....5..5 %e A225996 ..5..5...-4..5....5..5...-4.-4....5.-4....5..5...-4.-4...-4.-4...-4.-4....5..5 %e A225996 .-4..5...-4..5....5.-4...-4.-4....5..5....5..5...-4.-4...-4.-4...-4.-4....5.-4 %e A225996 ..5..5....5..5....5.-4...-4.-4...-4..5...-4..5....5.-4...-4..5....5.-4....5..5 %K A225996 nonn %O A225996 1,1 %A A225996 _R. H. Hardin_, May 22 2013