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!)
A207221 T(n,k)=Number of nXk 0..2 arrays avoiding the pattern z z+1 z in any row or column 7
3, 9, 9, 25, 81, 25, 69, 625, 625, 69, 191, 4761, 12534, 4761, 191, 529, 36481, 247163, 247163, 36481, 529, 1465, 279841, 4916282, 12584703, 4916282, 279841, 1465, 4057, 2146225, 97935886, 647820815, 647820815, 97935886, 2146225, 4057, 11235 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

....3........9..........25.............69................191

....9.......81.........625...........4761..............36481

...25......625.......12534.........247163............4916282

...69.....4761......247163.......12584703..........647820815

..191....36481.....4916282......647820815........86510224720

..529...279841....97935886....33403462497.....11574609426324

.1465..2146225..1950327875..1721695415743...1547869995556777

.4057.16459249.38835489653.88730578258613.206971107381598775

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..143

EXAMPLE

Some solutions for n=4 k=3

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

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

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

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

CROSSREFS

Column 1 is A098182(n+1)

Column 2 is A206857

Sequence in context: A206863 A206957 A207989 * A217999 A207550 A207317

Adjacent sequences:  A207218 A207219 A207220 * A207222 A207223 A207224

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Feb 16 2012

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 August 10 04:38 EDT 2020. Contains 336368 sequences. (Running on oeis4.)