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!)
A240518 Number of nX7 0..1 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..1 introduced in row major order 1
21, 86, 515, 3765, 28942, 231665, 1906245, 16000486, 135790448, 1158315893, 9946076742, 85823282205, 743139183617, 6451236349918, 56119492560507, 488978060398481, 4265874977466648, 37250999894755072, 325525391487428809 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A240519

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..169

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A045016 A171129 A301540 * A219850 A158540 A304514

Adjacent sequences:  A240515 A240516 A240517 * A240519 A240520 A240521

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 06 2014

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 25 08:33 EST 2021. Contains 341606 sequences. (Running on oeis4.)