A301828 Number of 7Xn 0..1 arrays with every element equal to 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero.

0, 233, 64, 1183, 19130, 147954, 2341241, 24102055, 298497818, 3505205058, 41108505612, 488703775775, 5745894085957, 68034532914313, 802101978217021, 9479073301967998, 111895780368223703, 1321526207564475140

Offset

1,2

Comments

Row 7 of A301823.

Links

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

Example

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

Crossrefs

Cf. A301823.

Sequence in context: A139673 A252003 A151629 * A132917 A139652 A126979

Adjacent sequences: A301825 A301826 A301827 * A301829 A301830 A301831

Keyword

nonn

Author

R. H. Hardin, Mar 27 2018

Status

approved