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

 

Logo

Many excellent designs for a new banner were submitted. We will use the best of them in rotation.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A198702 Number of nX2 0..4 arrays with values 0..4 introduced in row major order and each element equal to at least one horizontal or vertical neighbor 1
1, 3, 14, 76, 488, 3508, 27422, 227045, 1950662, 17146596, 152812056, 1373072354, 12397256874, 112250461201, 1018054465392, 9242194131044, 83950882529364, 762814946316712, 6932614771099750, 63012101072493525, 572768961745981914 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A198708

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = 17*a(n-1) -80*a(n-2) +37*a(n-3) +349*a(n-4) -60*a(n-5) -729*a(n-6) -553*a(n-7) +572*a(n-8) +783*a(n-9) +139*a(n-10) -304*a(n-11) -170*a(n-12)

EXAMPLE

All solutions with all values 0 to 4 for n=5

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

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

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

..3..3....3..3....3..3....3..4....2..3....2..3....3..4....3..4

..4..4....4..4....4..4....3..4....4..4....4..4....3..4....3..4

CROSSREFS

Sequence in context: A133798 A100937 A223026 * A198621 A198649 A198656

Adjacent sequences:  A198699 A198700 A198701 * A198703 A198704 A198705

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 29 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified April 23 04:43 EDT 2014. Contains 240909 sequences.