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A088658 Number of triangles in an n X n unit grid that have minimal possible area (of 1/2). 2
0, 4, 32, 124, 320, 716, 1328, 2340, 3792, 5852, 8544, 12260, 16864, 22916, 30272, 39188, 49824, 62948, 78080, 96348, 117232, 141260, 168480, 200292, 235680, 276100, 321056, 371484, 427024, 489900, 558112, 634724, 718432, 810116, 909600, 1018388, 1135136, 1263828, 1402304, 1551908 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Ray Chandler, Table of n, a(n) for n = 1..1000

FORMULA

a(n+1) = 4*A115004(n).

EXAMPLE

a(2)=4 because 4 (isosceles right) triangles with area 1/2 can be placed on a 2 X 2 grid.

CROSSREFS

Cf. A045996.

Sequence in context: A033430 A267668 A239056 * A088802 A123854 A301843

Adjacent sequences:  A088655 A088656 A088657 * A088659 A088660 A088661

KEYWORD

nonn

AUTHOR

Yuval Dekel (dekelyuval(AT)hotmail.com), Nov 21 2003

EXTENSIONS

a(7)-a(28) from Ray Chandler, May 03 2011

Corrected and extended by Ray Chandler, May 18 2011

STATUS

approved

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Last modified July 19 08:49 EDT 2019. Contains 325155 sequences. (Running on oeis4.)