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 A080819 #6 Jun 08 2019 16:24:10 %S A080819 1,4,9,16,16,25,36,36,49,64,81,81,100,121,121,144,169,196,196,225,256, %T A080819 256,289,324,361,361,400,441,441,484,529,529,576,625,676,676,729,784, %U A080819 784,841,900,961,961,1024,1089,1089,1156,1225,1225,1296,1369,1444,1444 %N A080819 Row sums from triangle in A080818. %F A080819 a(n) = (ceiling(sqrt(n*(n+1)/2)))^2. - C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004 %p A080819 seq((ceil(sqrt(n*(n+1)/2)))^2,n=1..60); # C. Ronaldo %Y A080819 Cf. A080817, A080818, A080820. %K A080819 nonn %O A080819 1,2 %A A080819 _Amarnath Murthy_, Mar 21 2003 %E A080819 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004