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!)
A210270 Half the number of (n+1)X3 0..2 arrays with every 2X2 subblock having two or three distinct clockwise edge differences 1
273, 5558, 113248, 2307956, 47036870, 958632858, 19537398722, 398181683100, 8115136633050, 165390438528106, 3370737726383882, 68697277333917074, 1400083986498649180, 28534393870466854178, 581544851172163483038 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A210276

LINKS

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

FORMULA

Empirical: a(n) = 20*a(n-1) +26*a(n-2) -364*a(n-3) -218*a(n-4) +1203*a(n-5) -418*a(n-6) -394*a(n-7) +216*a(n-8) -20*a(n-9)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A029567 A028534 A279114 * A321035 A225702 A307537

Adjacent sequences:  A210267 A210268 A210269 * A210271 A210272 A210273

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 19 2012

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 October 27 20:18 EDT 2021. Contains 348290 sequences. (Running on oeis4.)