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!)
A223145 Number of nX3 0..2 arrays with no more than floor(nX3/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order 1
2, 31, 211, 4065, 23376, 487176, 2859044, 61675900, 371133369, 8139180914, 49841557459, 1103204549801, 6833901039820, 152165504230294, 950031309571622, 21243203251932990, 133380148664076565, 2991998436727716610 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A223149

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..157

EXAMPLE

Some solutions for n=3

..0..1..2....0..1..0....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2

..2..1..0....1..2..0....2..0..0....2..0..1....1..1..0....1..0..2....2..2..2

..0..2..0....0..1..2....1..0..1....1..2..0....0..2..1....2..1..0....0..1..0

CROSSREFS

Sequence in context: A042059 A137626 A134179 * A188225 A164676 A004307

Adjacent sequences:  A223142 A223143 A223144 * A223146 A223147 A223148

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 16 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 May 30 15:01 EDT 2020. Contains 334726 sequences. (Running on oeis4.)