login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A210329 1/4 the number of (n+1)X3 0..3 arrays with every 2X2 subblock having two or three distinct clockwise edge differences 1
406, 11877, 344659, 10050240, 293095459, 8549740834, 249408131339, 7275728429567, 212248230477148, 6191735605717011, 180626272896775892, 5269258543534397671, 153715660936507360882, 4484218150761298939517 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A210335

LINKS

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

FORMULA

Empirical: a(n) = 47*a(n-1) -547*a(n-2) -255*a(n-3) +35216*a(n-4) -129394*a(n-5) -465060*a(n-6) +2920628*a(n-7) +320982*a(n-8) -20531472*a(n-9) +17232541*a(n-10) +55329403*a(n-11) -75077657*a(n-12) -49764339*a(n-13) +111287472*a(n-14) -12747232*a(n-15) -52250238*a(n-16) +26800488*a(n-17) -2501204*a(n-18) -451078*a(n-19) -5036*a(n-20)

EXAMPLE

Some solutions for n=4

..3..0..1....1..2..1....1..3..3....2..1..1....2..1..3....1..3..1....1..0..0

..2..1..2....1..3..2....3..1..1....0..0..0....2..1..1....1..1..1....0..0..1

..3..1..1....1..3..1....1..3..2....1..0..1....2..0..1....2..3..2....1..2..1

..1..3..3....1..3..2....3..1..1....1..0..1....2..1..0....1..1..1....1..0..0

..3..1..3....1..1..2....1..1..2....0..0..1....0..0..1....3..3..1....0..0..3

CROSSREFS

Sequence in context: A203710 A251096 A233052 * A317982 A203936 A172891

Adjacent sequences:  A210326 A210327 A210328 * A210330 A210331 A210332

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 20 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 January 17 15:20 EST 2022. Contains 350402 sequences. (Running on oeis4.)