A302004 Number of 7Xn 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

0, 233, 499, 1394, 110036, 729297, 15243860, 204666568, 2933712940, 44201068772, 631467436258, 9310616032492, 135219892970154, 1977188363830961, 28827781254085548, 420748594948205104, 6138969205830064789

Offset

1,2

Comments

Row 7 of A301999.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Cf. A301999.

Sequence in context: A154621 A243891 A142644 * A308786 A097447 A142783

Adjacent sequences: A302001 A302002 A302003 * A302005 A302006 A302007

Keyword

nonn

Author

R. H. Hardin, Mar 30 2018

Status

approved