login
This site is supported by donations to The OEIS Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A240625 Number of nX2 0..3 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..3 introduced in row major order 1
2, 10, 109, 1332, 16624, 208015, 2604059, 32601488, 408158709, 5110007540, 63975568178, 800952543871, 10027655890879, 125542872147582, 1571754448134085, 19677835970041564, 246359874423207164 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A240629

LINKS

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

FORMULA

Empirical: a(n) = 14*a(n-1) -14*a(n-2) -60*a(n-3) +29*a(n-4) +150*a(n-5) -47*a(n-6) -124*a(n-7) -4*a(n-8) +84*a(n-9) -27*a(n-10) for n>11

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A003222 A262145 A003167 * A062412 A212491 A006608

Adjacent sequences:  A240622 A240623 A240624 * A240626 A240627 A240628

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 09 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 December 8 12:07 EST 2019. Contains 329862 sequences. (Running on oeis4.)