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 A225993 #7 Sep 06 2013 02:05:04 %S A225993 102,211332,720120000,1722187940880,4204143930847392, %T A225993 11097567635368456704,29480432084171748705792, %U A225993 78401556201196275000295680,210537848971493804380009055232,569368618586592872585662539389952 %N A225993 Number of pairs of orthogonal (-1,5) vectors of length 6*n. %C A225993 Row 7 of A225987. %H A225993 R. H. Hardin, <a href="/A225993/b225993.txt">Table of n, a(n) for n = 1..91</a> %e A225993 Some solutions for n=1 %e A225993 .-1..5...-1..5...-1..5...-1..5...-1..5...-1..5...-1..5...-1..5...-1..5...-1..5 %e A225993 .-1..5...-1..5...-1.-1...-1..5....5.-1...-1..5...-1..5....5..5....5.-1....5.-1 %e A225993 .-1..5...-1..5...-1.-1....5.-1....5.-1...-1..5....5..5...-1..5...-1..5....5..5 %e A225993 ..5..5...-1..5...-1.-1....5..5...-1..5....5.-1...-1..5...-1..5...-1..5...-1..5 %e A225993 .-1..5....5..5...-1.-1...-1..5...-1..5....5.-1...-1..5....5.-1....5..5....5.-1 %e A225993 .-1..5....5.-1...-1.-1...-1..5....5..5....5..5....5.-1...-1..5....5.-1....5.-1 %K A225993 nonn %O A225993 1,1 %A A225993 _R. H. Hardin_, May 22 2013