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 A225994 #7 Sep 06 2013 02:05:08 %S A225994 378,5133128,81705087744,983771662124160,13027612739061516288, %T A225994 180842352214339004973056,2505372582582745606695616512, %U A225994 35065654463193295271305370959872,495605164965018396615832445084368896 %N A225994 Number of pairs of orthogonal (-2,5) vectors of length 7*n. %C A225994 Row 8 of A225987. %H A225994 R. H. Hardin, <a href="/A225994/b225994.txt">Table of n, a(n) for n = 1..78</a> %e A225994 Some solutions for n=1 %e A225994 .-2..5...-2..5...-2..5...-2..5....5..5...-2..5....5..5....5..5...-2..5...-2..5 %e A225994 .-2..5....5..5....5.-2...-2..5....5..5....5..5...-2..5...-2..5....5..5....5.-2 %e A225994 ..5..5...-2..5....5.-2....5.-2...-2..5....5.-2....5.-2....5.-2....5.-2....5..5 %e A225994 .-2..5...-2..5....5.-2....5.-2...-2..5....5..5...-2..5....5..5....5.-2....5..5 %e A225994 ..5.-2....5.-2....5.-2....5..5....5.-2....5.-2...-2..5...-2..5....5.-2...-2..5 %e A225994 ..5..5....5..5....5..5....5.-2...-2..5....5.-2....5.-2....5.-2....5.-2...-2..5 %e A225994 ..5.-2....5.-2....5..5....5..5...-2..5...-2..5....5..5....5.-2....5..5...-2..5 %K A225994 nonn %O A225994 1,1 %A A225994 _R. H. Hardin_, May 22 2013