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 A086460 #4 Mar 30 2012 18:58:53 %S A086460 1,1,0,1,1,0,1,2,2,0,1,3,4,3,0,1,4,6,6,4,0,1,5,8,9,8,5,0,1,6,10,12,12, %T A086460 10,6,0,1,7,12,15,16,15,12,7,0,1,8,14,18,20,20,18,14,8,0,1,9,16,21,24, %U A086460 25,24,21,16,9,0,1,10,18,24,28,30,30,28,24,18,10,0,1,11,20,27,32,35,36 %N A086460 Square array read by antidiagonals: T(n,k)=nk+0^n. %C A086460 Rows include A028310, A004277, A008486, A008574, A008706, A008458. Main diagonal is n^2+0^n (A000290, preceded by extra 1). Inverse binomial transform of array A049513. %F A086460 T(n, k)=nk+0^n %e A086460 Rows begin %e A086460 1 0 0 0 0 ... %e A086460 1 1 2 3 4 ... %e A086460 1 2 4 6 8 ... %e A086460 1 3 6 9 12 ... %e A086460 1 4 8 12 16 ... %K A086460 easy,nonn,tabl %O A086460 0,8 %A A086460 _Paul Barry_, Jul 21 2003