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A189813 Number of right triangles on a (n+1)X9 grid 1
158, 550, 1236, 2250, 3596, 5250, 7224, 9496, 12044, 14860, 17948, 21266, 24852, 28634, 32604, 36780, 41168, 45716, 50440, 55324, 60384, 65612, 71000, 76532, 82240, 88116, 94136, 100300, 106624, 113100, 119744, 126532, 133472, 140560, 147792 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 8 of A189814

LINKS

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

FORMULA

Empirical: a(n) = 72*n^2 + 2344*n - 23112 for n>63

EXAMPLE

Some solutions for n=3

..2..8....2..2....0..6....0..6....3..0....1..3....0..2....0..8....3..5....3..8

..2..1....2..7....0..5....0..4....0..0....0..3....0..1....0..7....1..1....0..8

..3..8....3..2....2..6....1..6....3..8....1..7....1..2....3..8....1..6....3..7

CROSSREFS

Sequence in context: A258960 A072555 A056088 * A270791 A180096 A250996

Adjacent sequences:  A189810 A189811 A189812 * A189814 A189815 A189816

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 28 2011

STATUS

approved

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Last modified May 15 01:43 EDT 2021. Contains 343909 sequences. (Running on oeis4.)