login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A301668 Number of nX7 0..1 arrays with every element equal to 1, 2 or 4 horizontally or vertically adjacent elements, with upper left element zero. 1
8, 421, 5289, 71564, 1073621, 15498505, 225780260, 3307561389, 48158543096, 703127937300, 10259186324647, 149696614458243, 2184338617470806, 31873058777880129, 465081902561442941, 6786326832276152384 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A301669.

LINKS

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

EXAMPLE

Some solutions for n=5

..0..0..0..1..1..0..0. .0..0..1..1..0..0..1. .0..0..0..1..1..0..1

..0..1..1..0..0..1..1. .0..1..0..0..1..0..1. .0..1..0..0..1..0..1

..0..0..1..0..1..0..1. .0..1..0..1..1..0..1. .0..1..1..0..1..1..0

..1..0..1..0..1..0..1. .0..1..0..1..0..0..0. .0..0..0..1..0..1..0

..1..1..0..0..1..0..1. .0..1..0..1..1..0..0. .1..1..0..1..0..1..1

CROSSREFS

Cf. A301669.

Sequence in context: A267162 A193372 A185833 * A038781 A092868 A038782

Adjacent sequences:  A301665 A301666 A301667 * A301669 A301670 A301671

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 25 2018

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 17 04:58 EDT 2019. Contains 327119 sequences. (Running on oeis4.)