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 A226001 #10 Aug 19 2022 12:22:39 %S A226001 8160,11670170880,13816736416550400,8837797610915077242880, %T A226001 7704457212444839067088322560,7041012236359757418211467425218560, %U A226001 6005570486226633002683450297283300556800 %N A226001 Number of pairs of orthogonal (-3,7) vectors of length 10*n. %C A226001 Row 15 of A225987. %H A226001 R. H. Hardin, <a href="/A226001/b226001.txt">Table of n, a(n) for n = 1..45</a> %e A226001 Some solutions for n=1 %e A226001 .-3..7...-3..7...-3..7....7..7....7..7...-3..7....7..7...-3..7...-3.-3....7..7 %e A226001 .-3..7....7.-3....7.-3...-3..7...-3..7....7..7...-3..7...-3..7...-3..7...-3..7 %e A226001 ..7.-3....7..7....7.-3....7..7....7.-3....7.-3...-3..7....7..7...-3.-3....7..7 %e A226001 ..7.-3...-3..7...-3..7...-3..7...-3..7...-3..7...-3..7....7..7...-3.-3....7.-3 %e A226001 ..7.-3....7.-3...-3..7....7..7....7..7...-3..7....7.-3....7.-3...-3.-3....7.-3 %e A226001 .-3..7...-3..7....7.-3...-3..7...-3..7....7..7....7..7....7.-3...-3..7....7..7 %e A226001 ..7..7....7..7....7..7...-3..7....7.-3....7.-3....7.-3...-3..7...-3.-3....7.-3 %e A226001 ..7..7...-3..7....7..7....7.-3....7..7....7..7...-3..7....7.-3...-3.-3...-3..7 %e A226001 ..7..7...-3..7....7..7...-3..7...-3..7...-3..7....7.-3...-3..7...-3.-3....7.-3 %e A226001 ..7.-3....7..7...-3..7....7.-3...-3..7....7.-3....7..7....7..7...-3..7....7.-3 %Y A226001 Cf. A225987. %K A226001 nonn %O A226001 1,1 %A A226001 _R. H. Hardin_, May 22 2013