login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A228658 Number of n X 6 binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally. 1
8, 80, 968, 11148, 128740, 1482892, 17074988, 196565912, 2262692928, 26045341080, 299798763232, 3450863834052, 39721453897148, 457216814726132, 5262827734777604, 60578160174884624, 697289282211813816 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

FORMULA

Empirical: a(n) = 14*a(n-1) - 17*a(n-2) - 142*a(n-3) + 59*a(n-4) + 352*a(n-5) + 103*a(n-6) - 48*a(n-7).

Empirical g.f.: 4*x*(2 - 8*x - 4*x^2 + 23*x^3 + 3*x^4 - 8*x^5) / (1 - 14*x + 17*x^2 + 142*x^3 - 59*x^4 - 352*x^5 - 103*x^6 + 48*x^7). - Colin Barker, Sep 12 2018

EXAMPLE

Some solutions for n=4:

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

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

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

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

CROSSREFS

Column 6 of A228660.

Sequence in context: A328128 A053175 A051580 * A234596 A060375 A097815

Adjacent sequences:  A228655 A228656 A228657 * A228659 A228660 A228661

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 29 2013

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 January 22 19:39 EST 2020. Contains 331153 sequences. (Running on oeis4.)