login
Number of kites on an n X n grid (or geoboard).
4

%I #26 Feb 09 2024 10:46:24

%S 0,1,10,58,222,631,1584,3340,6504,11697,19978,31922,49822,74167,

%T 107672,152484,211944,286725,383578,502262,651526,833979,1056104,

%U 1318104,1637336,2011577,2452634,2965902,3568086,4253755,5055448,5960480,6999104,8173985,9503674,10994202

%N Number of kites on an n X n grid (or geoboard).

%C Only convex kites are counted, not concave kites (sometimes called darts or arrowheads).

%H Lucas A. Brown, <a href="https://github.com/lucasaugustus/oeis/blob/main/A189417.py">Python program</a>.

%H Nathaniel Johnston, <a href="/A189417/a189417.c.txt">C program for computing terms</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Kite.html">Kite</a>.

%Y Cf. A181946, A189413, A189414.

%K nonn

%O 1,3

%A _Martin Renner_, Apr 21 2011

%E a(7)-a(29) from _Nathaniel Johnston_, Apr 27 2011

%E a(30)-a(36) from _Lucas A. Brown_, Feb 09 2024