A272957 Number of nX7 0..1 arrays with exactly n+7-2 having value 1 and no three 1s forming an isosceles right triangle.

7, 100, 499, 1840, 8211, 26052, 131056, 648178, 4336294

Offset

1,1

Comments

Column 7 of A272958.

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=5
..1..0..0..0..0..0..1. .1..1..0..0..0..0..1. .0..1..0..0..0..0..0
..0..0..0..0..0..0..0. .0..0..0..0..0..0..1. .0..1..0..0..0..1..1
..1..0..0..1..0..0..1. .1..0..0..0..0..1..0. .0..1..0..0..1..0..0
..1..0..0..0..1..0..1. .1..0..0..0..1..0..0. .0..1..0..0..0..0..1
..1..0..0..0..0..0..1. .0..1..0..0..0..0..1. .0..1..0..0..0..0..1

Crossrefs

Cf. A272958.

Sequence in context: A041084 A115066 A340887 * A123616 A001594 A297151

Adjacent sequences: A272954 A272955 A272956 * A272958 A272959 A272960

Keyword

nonn

Author

R. H. Hardin, May 11 2016

Status

approved