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 A189417 #27 Feb 16 2025 08:33:14 %S A189417 0,1,10,58,222,631,1584,3340,6504,11697,19978,31922,49822,74167, %T A189417 107672,152484,211944,286725,383578,502262,651526,833979,1056104, %U A189417 1318104,1637336,2011577,2452634,2965902,3568086,4253755,5055448,5960480,6999104,8173985,9503674,10994202 %N A189417 Number of kites on an n X n grid (or geoboard). %C A189417 Only convex kites are counted, not concave kites (sometimes called darts or arrowheads). %H A189417 Lucas A. Brown, <a href="https://github.com/lucasaugustus/oeis/blob/main/A189417.py">Python program</a>. %H A189417 Nathaniel Johnston, <a href="/A189417/a189417.c.txt">C program for computing terms</a> %H A189417 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Kite.html">Kite</a>. %Y A189417 Cf. A181946, A189413, A189414. %K A189417 nonn %O A189417 1,3 %A A189417 _Martin Renner_, Apr 21 2011 %E A189417 a(7)-a(29) from _Nathaniel Johnston_, Apr 27 2011 %E A189417 a(30)-a(36) from _Lucas A. Brown_, Feb 09 2024