A189811 Number of right triangles on a (n+1)X7 grid

94, 330, 732, 1308, 2060, 2960, 4032, 5250, 6604, 8082, 9684, 11388, 13220, 15144, 17156, 19268, 21484, 23784, 26176, 28656, 31236, 33900, 36648, 39480, 42404, 45420, 48520, 51704, 54972, 58324, 61768, 65296, 68908, 72604, 76384, 80248, 84200, 88236

Offset

1,1

Comments

Column 6 of A189814

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

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

Example

Some solutions for n=3
..3..3....1..4....3..3....1..2....2..3....3..3....0..3....2..4....2..5....1..3
..0..3....0..5....1..3....0..2....0..3....2..3....0..4....1..4....1..5....0..1
..3..4....2..5....3..5....1..4....2..5....3..2....3..3....2..2....2..2....3..2

Crossrefs

Sequence in context: A107412 A115996 A188185 * A202415 A174337 A354481

Adjacent sequences: A189808 A189809 A189810 * A189812 A189813 A189814

Keyword

nonn

Author

R. H. Hardin Apr 28 2011

Status

approved