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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A200801 T(n,k)=Number of nXk 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors 8
1, 2, 2, 5, 15, 5, 15, 178, 178, 15, 51, 2614, 9880, 2614, 51, 187, 40148, 583813, 583813, 40148, 187, 715, 622645, 34679839, 132636590, 34679839, 622645, 715, 2795, 9676364, 2060918000, 30147154218, 30147154218, 2060918000, 9676364, 2795 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Table starts

.....1...........2.................5......................15

.....2..........15...............178....................2614

.....5.........178..............9880..................583813

....15........2614............583813...............132636590

....51.......40148..........34679839.............30147154218

...187......622645........2060918000...........6852264918471

...715.....9676364......122478253815........1557479347400065

..2795...150442627.....7278777317468......354005859128023982

.11051..2339207390...432571571252989....80463441477635545163

.43947.36372631268.25707362563355693.18288865135614195620421

LINKS

Ron Hardin, Table of n, a(n) for n = 1..97

EXAMPLE

Some solutions for n=5 k=3

..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0

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

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

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

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

CROSSREFS

Column 1 is A007581(n-1)

Sequence in context: A291573 A208353 A208001 * A241119 A208408 A198528

Adjacent sequences:  A200798 A200799 A200800 * A200802 A200803 A200804

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Nov 22 2011

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 September 21 04:58 EDT 2020. Contains 337267 sequences. (Running on oeis4.)