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A272959 Number of nXn 0..1 arrays with exactly n+n-1 having value 1 and no three 1s forming an isosceles right triangle. 0
1, 0, 0, 0, 12, 192, 4892, 230268 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Diagonal of A272965.

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Cf. A272965.

Sequence in context: A212596 A051620 A144347 * A095351 A061065 A210356

Adjacent sequences:  A272956 A272957 A272958 * A272960 A272961 A272962

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 11 2016

STATUS

approved

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Last modified June 21 21:20 EDT 2018. Contains 305640 sequences. (Running on oeis4.)