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 A085391 #8 Dec 28 2012 08:50:54 %S A085391 0,1,0,1,1,0,1,3,1,0,1,4,5,1,0,1,5,10,7,1,0,1,6,15,19,9,1,0,1,7,21,35, %T A085391 31,11,1,0,1,8,28,56,69,46,13,1,0,1,9,36,84,126,121,64,15,1,0,1,10,45, %U A085391 120,210,251,195,85,17,1,0,1,11,55,165,330,462,456,295,109,19,1,0 %N A085391 Square array of centered numbers, read by antidiagonals. %F A085391 Square array T(n, k)=C(n+k, k)-C(n, k). %F A085391 Row k has g.f. (1-x^k)/(1-x)^(k+1). %e A085391 Rows begin %e A085391 0 0 0 0 0 0 ... %e A085391 1 1 1 1 1 1 ... %e A085391 1 3 5 7 9 11 ... %e A085391 1 4 10 19 31 46 ... %e A085391 1 5 15 35 69 121... %Y A085391 Rows include A005408, A005448, A005894, A008498, A008499, A008500, A008501. %Y A085391 Diagonals include A030662, A001700, A001791, A002054, A002694, A003516. %K A085391 easy,nonn,tabl %O A085391 0,8 %A A085391 _Paul Barry_, Jul 02 2003