A272969 Number of nX4 0..1 arrays with exactly n+4-2 having value 1 and no three 1s forming an isosceles triangle.

4, 21, 4, 8, 4, 37, 8, 44, 8, 44, 0, 34, 4, 44, 0, 48, 0, 52

Offset

1,1

Comments

Column 4 of A272973.

Links

Table of n, a(n) for n=1..18.

Example

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

Crossrefs

Cf. A272973.

Sequence in context: A146342 A103896 A244955 * A327085 A083192 A225540

Adjacent sequences: A272966 A272967 A272968 * A272970 A272971 A272972

Keyword

nonn

Author

R. H. Hardin, May 11 2016

Status

approved