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 A257927 #12 Jul 28 2015 12:38:08 %S A257927 0,3,0,2,0,0,1,0,0,0,1,6,0,0,0,1,5,6,0,0,0,1,4,0,6,0,0,0,1,3,0,0,6,0, %T A257927 0,0,1,2,3,0,0,6,0,0,0,1,2,8,3,0,0,6,0,0,0,1,2,5,5,3,0,0,6,0,0,0,1,2, %U A257927 2,0,7,3,0,0,6,0,0,0,1,1,0,2,0,1,3,0,0,6,0,0,0 %N A257927 Array read by antidiagonals: M[i,j] = j-th decimal digit of (i+1)/(i-1) for i, j = 1,2,3,4,5,... or 0 if undefined. %C A257927 Main diagonal M[n.n] = 0,0,0,6,0,0,3,2,0,2,... %e A257927 ============================================================ %e A257927 i \ j .1. |.2. |.3. |.4. |.5. |.6. |.7. |.8. |.9. |.10.|. %e A257927 ============================================================ %e A257927 i=1.......0. |.0. |.0. |.0. |.0. |.0. |.0. |.0. |.0. |.0. |. %e A257927 i=2.......3. |.0. |.0. |.0. |.0. |.0. |.0. |.0. |.0. |.0. |. %e A257927 i=3.......2. |.0. |.0. |.0. |.0. |.0. |.0. |.0. |.0. |.0. |. %e A257927 i=4.......1. |.6. |.6. |.6. |.6. |.6. |.6. |.6. |.6. |.6. |. %e A257927 i=5.......1. |.5. |.0. |.0. |.0. |.0. |.0. |.0. |.0. |.0. |. %e A257927 i=6.......1. |.4. |.0. |.0. |.0. |.0. |.0. |.0. |.0. |.0. |. %e A257927 i=7.......1. |.3. |.3. |.3. |.3. |.3. |.3. |.3. |.3. |.3. |. %e A257927 i=8.......1. |.2. |.8. |.5. |.7. |.1. |.4. |.2. |.8. |.5. |. %e A257927 i=9.......1. |.2. |.5. |.0. |.0. |.0. |.0. |.0. |.0. |.0. |. %e A257927 i=10......1. |.2. |.2. |.2. |.2. |.2. |.2. |.2. |.2. |.2. |. %e A257927 ============================================================ %K A257927 nonn,tabl,base %O A257927 1,2 %A A257927 _Jonathan Vos Post_, Jul 13 2015