A272972 Number of nX7 0..1 arrays with exactly n+7-2 having value 1 and no three 1s forming an isosceles triangle.

7, 18, 23, 8, 10, 4, 4, 4, 2, 48, 24

Offset

1,1

Comments

Column 7 of A272973.

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=3
..1..0..0..0..0..1..0. .1..1..1..1..1..1..0. .0..1..0..0..0..0..1
..1..0..0..0..0..1..0. .0..0..0..0..0..0..1. .0..1..0..0..0..0..1
..0..1..1..1..0..0..1. .0..0..0..0..0..0..1. .1..0..0..1..1..1..0

Crossrefs

Cf. A272973.

Sequence in context: A091832 A374460 A256011 * A391309 A070609 A007236

Adjacent sequences: A272969 A272970 A272971 * A272973 A272974 A272975

Keyword

nonn

Author

R. H. Hardin, May 11 2016

Status

approved