A272964 Number of nX7 0..1 arrays with exactly n+7-1 having value 1 and no three 1s forming an isosceles right triangle.

1, 1, 16, 71, 367, 838, 4892, 26051, 198970

Offset

1,3

Comments

Column 7 of A272965.

Links

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

Example

Some solutions for n=6
..1..0..0..1..1..0..1. .0..0..0..1..1..1..1. .0..0..1..0..1..1..0
..0..0..0..0..0..0..1. .0..1..0..0..0..0..0. .0..1..0..0..0..0..1
..0..0..0..0..0..1..0. .1..0..0..0..0..0..0. .1..0..0..0..0..0..0
..0..1..0..0..0..0..0. .1..0..0..0..0..0..0. .1..0..0..0..0..0..0
..0..1..0..0..0..0..1. .0..1..0..1..0..0..0. .1..0..0..1..0..1..0
..1..0..0..1..0..0..1. .0..0..0..1..0..1..1. .1..0..0..0..0..0..1

Crossrefs

Cf. A272965.

Sequence in context: A284844 A258724 A264888 * A232579 A212862 A253151

Adjacent sequences: A272961 A272962 A272963 * A272965 A272966 A272967

Keyword

nonn

Author

R. H. Hardin, May 11 2016

Status

approved