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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A230835 Number of nX2 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero 1
0, 2, 22, 162, 1202, 8974, 66990, 500018, 3732178, 27857358, 207930158, 1552011826, 11584373970, 86466944462, 645398059822, 4817316700722, 35956941366482, 268386264128974, 2003262347565870, 14952553724011058, 111607380401824978 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A230840

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) -5*a(n-2) +8*a(n-3) -4*a(n-4)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A265864 A091169 A279380 * A270407 A000184 A007613

Adjacent sequences:  A230832 A230833 A230834 * A230836 A230837 A230838

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 31 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 25 04:05 EST 2018. Contains 299630 sequences. (Running on oeis4.)