A222897 - OEIS

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A222897

Number of n X n 0..1 arrays with successive rows and columns fitting to straight lines with strictly increasing slope, with a single point array taken as having zero slope

2, 5, 8, 251, 1872, 720452, 33675352

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Diagonal of A222898

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=4

..1..1..0..0....1..1..0..0....1..0..0..0....1..1..0..0....1..1..0..0

..0..0..0..0....1..0..0..0....0..0..0..0....0..1..0..0....1..0..0..0

..0..1..0..1....0..1..1..0....1..0..1..1....0..0..0..0....1..1..0..1

..0..1..1..1....0..0..0..1....0..0..0..1....0..1..0..1....0..1..1..1

CROSSREFS

Sequence in context: A061354 A162709 A242875 * A282455 A323457 A011039

Adjacent sequences: A222894 A222895 A222896 * A222898 A222899 A222900

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 08 2013

STATUS

approved