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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A234781 Number of (n+1)X(3+1) 0..3 arrays with no adjacent elements equal and with each 2X2 subblock having the number of clockwise edge increases equal to the number of counterclockwise edge increases 1
3084, 91916, 2761748, 83120724, 2502596188, 75353928188, 2268967605156, 68320694237108, 2057200342508092, 61944247178059100, 1865199913242292132, 56162935264244462548, 1691119155959930890236, 50921198959363203903516 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A234786

LINKS

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

FORMULA

Empirical: a(n) = 45*a(n-1) -528*a(n-2) +2592*a(n-3) -5997*a(n-4) +5689*a(n-5) +812*a(n-6) -4760*a(n-7) +1942*a(n-8) +278*a(n-9) -112*a(n-10)

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A186470 A322607 A284660 * A045079 A195811 A268578

Adjacent sequences:  A234778 A234779 A234780 * A234782 A234783 A234784

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 30 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 December 6 13:45 EST 2021. Contains 349563 sequences. (Running on oeis4.)