A272956 Number of nX6 0..1 arrays with exactly n+6-2 having value 1 and no three 1s forming an isosceles right triangle.

6, 62, 236, 637, 1898, 7468, 26052, 138476, 831738, 4677062, 23090612

Offset

1,1

Comments

Column 6 of A272958.

Links

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

Example

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

Crossrefs

Cf. A272958.

Sequence in context: A271967 A271968 A022502 * A243643 A200803 A198965

Adjacent sequences: A272953 A272954 A272955 * A272957 A272958 A272959

Keyword

nonn

Author

R. H. Hardin, May 11 2016

Status

approved