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 A274652 #10 Nov 30 2016 01:04:31 %S A274652 0,3,6,12,13,25,36,43,57,67,100,134,115,163,153,186,185,248,277,258, %T A274652 306,366,370,381,528,471,607,662,610,706,778,760,783,782,950,970,975, %U A274652 1194,1206,1175,1301,1393,1438,1261,1584,1549,1592,1645,1776,1783,2010,1956,1953,2353,2441,2258,2468,2342,2635,2663 %N A274652 Sum of n-th antidiagonal of the square array A274528. %F A274652 a(n) = A274530(n+1) - n - 1. %Y A274652 Cf. A269526, A274528, A274529, A274530. %K A274652 nonn %O A274652 0,2 %A A274652 _Omar E. Pol_, Jul 01 2016