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 A030224 #12 Oct 28 2023 15:28:19 %S A030224 0,0,0,1,2,7,19,54,147,418,1150,3254,9138,25953,73717,210719,603370, %T A030224 1734739,4998542,14444576,41829991,121406927,353029078,1028417980, %U A030224 3000754648,8769118355,25661830891,75194886765,220605144778,647942827064,1905103686527,5607037213434,16517892572160,48703328674762 %N A030224 Triangular polyominoes (n-iamonds) without bilateral symmetry (holes are allowed). %H A030224 John Mason, <a href="/A030224/b030224.txt">Table of n, a(n) for n = 1..52</a> %Y A030224 Cf. A000577, A006534, A030223, A030224. %K A030224 nonn %O A030224 1,5 %A A030224 _David W. Wilson_ %E A030224 More terms from _Joseph Myers_, Sep 24 2002 %E A030224 More terms from _John Mason_, Oct 28 2023