A189812 Number of right triangles on a (n+1)X8 grid

124, 434, 972, 1754, 2784, 4032, 5520, 7224, 9128, 11218, 13500, 15938, 18568, 21328, 24216, 27248, 30432, 33728, 37152, 40696, 44376, 48176, 52096, 56128, 60288, 64572, 68968, 73476, 78104, 82844, 87712, 92692, 97784, 102988, 108304, 113740, 119296

Offset

1,1

Comments

Column 7 of A189814

Links

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

Formula

Empirical: a(n) = 56*n^2 + 1480*n - 12216 for n>48

Example

Some solutions for n=3
..3..5....0..2....2..2....0..3....3..3....0..3....1..7....3..0....2..7....2..5
..1..6....0..7....0..2....2..1....2..3....0..5....0..5....1..0....1..7....2..1
..2..3....1..2....2..7....2..5....3..2....2..3....3..6....3..7....2..6....3..5

Crossrefs

Sequence in context: A204642 A204635 A102589 * A230830 A038645 A038859

Adjacent sequences: A189809 A189810 A189811 * A189813 A189814 A189815

Keyword

nonn

Author

R. H. Hardin Apr 28 2011

Status

approved