A272955 - OEIS

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A272955

Number of nX5 0..1 arrays with exactly n+5-2 having value 1 and no three 1s forming an isosceles right triangle.

5, 34, 107, 210, 768, 1898, 8211, 37402, 192579, 635086, 2366644, 9742518, 38088673, 149636652, 590014096, 2364716800, 9270827068, 36956377972, 147747894211, 585280946044

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

OFFSET

1,1

COMMENTS

Column 5 of A272958.

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A272958.

Sequence in context: A068560 A039773 A289947 * A317297 A135973 A186636

Adjacent sequences: A272952 A272953 A272954 * A272956 A272957 A272958

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 11 2016

STATUS

approved