A189417 Number of kites on an n X n grid (or geoboard).

0, 1, 10, 58, 222, 631, 1584, 3340, 6504, 11697, 19978, 31922, 49822, 74167, 107672, 152484, 211944, 286725, 383578, 502262, 651526, 833979, 1056104, 1318104, 1637336, 2011577, 2452634, 2965902, 3568086, 4253755, 5055448, 5960480, 6999104, 8173985, 9503674, 10994202

Offset

1,3

Comments

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

Links

Table of n, a(n) for n=1..36.

Lucas A. Brown, Python program.

Nathaniel Johnston, C program for computing terms

Eric Weisstein's World of Mathematics, Kite.

Crossrefs

Cf. A181946, A189413, A189414.

Sequence in context: A229074 A103417 A189072 * A060157 A055583 A242202

Adjacent sequences: A189414 A189415 A189416 * A189418 A189419 A189420

Keyword

nonn

Author

Martin Renner, Apr 21 2011

Extensions

a(7)-a(29) from Nathaniel Johnston, Apr 27 2011

a(30)-a(36) from Lucas A. Brown, Feb 09 2024

Status

approved