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 A014721 #12 Nov 19 2018 02:39:32 %S A014721 1,1,9,1,16,1,100,25,1,225,36,1,1225,441,49,1,3136,784,64,1,15876, %T A014721 7056,1296,81,1,44100,14400,2025,100,1,213444,108900,27225,3025,121,1, %U A014721 627264,245025,48400,4356,144,1,2944656,1656369,511225,81796 %N A014721 Squares of elements to left of the central element in Pascal triangle (by row). %F A014721 a(n) = A014413(n)^2. - _Sean A. Irvine_, Nov 18 2018 %Y A014721 Cf. A014413. %K A014721 nonn,tabf %O A014721 1,3 %A A014721 _Mohammad K. Azarian_ %E A014721 More terms from _Sean A. Irvine_, Nov 18 2018 %E A014721 Offset corrected by _Joerg Arndt_, Nov 19 2018