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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A228659 Number of nX7 binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally. 1
13, 194, 3556, 62368, 1096624, 19236832, 337258048, 5910459096, 103561279328, 1814380139952, 31785935283840, 556837728488064, 9754730426036000, 170882696555044928, 2993497165464775680, 52439495408779417216 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A228660

LINKS

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

FORMULA

Empirical: a(n) = 30*a(n-1) -226*a(n-2) -108*a(n-3) +4324*a(n-4) -1612*a(n-5) -27016*a(n-6) -2240*a(n-7) +50112*a(n-8) +20032*a(n-9) -16768*a(n-10) -4864*a(n-11) +2048*a(n-12)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A213698 A159196 A177508 * A221581 A015690 A027773

Adjacent sequences:  A228656 A228657 A228658 * A228660 A228661 A228662

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 February 24 00:51 EST 2020. Contains 332195 sequences. (Running on oeis4.)