A189811 - OEIS

%I #5 Mar 31 2012 12:36:16

%S 94,330,732,1308,2060,2960,4032,5250,6604,8082,9684,11388,13220,15144,

%T 17156,19268,21484,23784,26176,28656,31236,33900,36648,39480,42404,

%U 45420,48520,51704,54972,58324,61768,65296,68908,72604,76384,80248,84200,88236

%N Number of right triangles on a (n+1)X7 grid

%C Column 6 of A189814

%H R. H. Hardin, <a href="/A189811/b189811.txt">Table of n, a(n) for n = 1..200</a>

%F Empirical: a(n) = 42*n^2 + 886*n - 6080 for n>35

%e Some solutions for n=3

%e ..3..3....1..4....3..3....1..2....2..3....3..3....0..3....2..4....2..5....1..3

%e ..0..3....0..5....1..3....0..2....0..3....2..3....0..4....1..4....1..5....0..1

%e ..3..4....2..5....3..5....1..4....2..5....3..2....3..3....2..2....2..2....3..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Apr 28 2011