A189810 Number of right triangles on a (n+1)X6 grid

68, 238, 524, 926, 1444, 2060, 2784, 3596, 4492, 5470, 6516, 7630, 8820, 10070, 11380, 12758, 14204, 15710, 17276, 18902, 20596, 22350, 24164, 26038, 27972, 29970, 32028, 34146, 36324, 38562, 40860, 43218, 45636, 48114, 50652, 53250, 55908, 58626, 61404

Offset

1,1

Comments

Column 5 of A189814

Links

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

Formula

Empirical: a(n) = 30*n^2 + 468*n - 2478 for n>24

Example

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

Crossrefs

Sequence in context: A044781 A317807 A292344 * A200198 A237745 A237740

Adjacent sequences: A189807 A189808 A189809 * A189811 A189812 A189813

Keyword

nonn

Author

R. H. Hardin Apr 28 2011

Status

approved