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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A236789 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock equal 9
81, 255, 255, 770, 1097, 770, 2475, 4452, 4452, 2475, 7967, 19851, 23675, 19851, 7967, 26320, 87889, 145124, 145124, 87889, 26320, 87685, 405350, 867928, 1287919, 867928, 405350, 87685, 296341, 1877803, 5547565, 10951425, 10951425, 5547565 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

......81.......255........770.........2475...........7967............26320

.....255......1097.......4452........19851..........87889...........405350

.....770......4452......23675.......145124.........867928..........5547565

....2475.....19851.....145124......1287919.......10951425........101820364

....7967.....87889.....867928.....10951425......128004881.......1684255298

...26320....405350....5547565....101820364.....1684255298......32223974061

...87685...1877803...35115362....921870137....20959676762.....570994921148

..296341...8891685..230220290...8733287503...278468706789...11000072878624

.1009386..42339874.1500418737..81211467440..3553360015495..200824005818655

.3469327.204256129.9979134414.774898990883.47248656876065.3868923775555236

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..180

FORMULA

Empirical for column k:

k=1: [linear recurrence of order 18]

k=2: [order 35]

k=3: [order 83]

EXAMPLE

Some solutions for n=3 k=4

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

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

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

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

CROSSREFS

Sequence in context: A225027 A225020 A219131 * A236798 A237067 A236782

Adjacent sequences:  A236786 A236787 A236788 * A236790 A236791 A236792

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Jan 31 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 November 29 14:23 EST 2020. Contains 338769 sequences. (Running on oeis4.)