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

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