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 A083731 #2 Mar 31 2012 13:21:56 %S A083731 1,1,0,1,0,0,1,1,-1,0,1,1,0,-1,0,1,2,0,-1,-1,0,1,2,1,-1,-1,-1,0,1,3,1, %T A083731 0,-2,-1,-1,0,1,3,3,-1,-1,-2,-1,-1,0,1,4,3,1,-2,-2,-2,-1,-1,0,1,4,5,1, %U A083731 -1,-3,-2,-2,-1,-1,0,1,5,6,3,-2,-2,-4,-2,-2,-1,-1,0,1,5,8,4,0,-4,-3,-4,-2,-2,-1,-1,0 %N A083731 Triangular array such that partial sums define A008284. %e A083731 Row 5 from A008284 is 1, 3, 3, 2, 1, 1, so row 6 is 1,2,0,-1,-1,0 %Y A083731 Cf. A008284. %K A083731 sign,tabl %O A083731 1,17 %A A083731 _Jon Perry_, Jun 16 2003