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!)
A235560 Number of (n+1)X(1+1) 0..2 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise 2
81, 537, 3199, 17837, 95679, 498597, 2546207, 12796069, 63520287, 312150917, 1521435839, 7364501157, 35440920159, 169704498117, 809104150911, 3843034229093, 18192875333663, 85871684446085, 404259277931583 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A235565

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) -9*a(n-2) -109*a(n-3) +254*a(n-4) +260*a(n-5) -1156*a(n-6) +576*a(n-7) +944*a(n-8) -1024*a(n-9) +256*a(n-10)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A253307 A235784 A235565 * A253468 A253462 A206512

Adjacent sequences:  A235557 A235558 A235559 * A235561 A235562 A235563

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 12 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 October 30 03:24 EDT 2020. Contains 338076 sequences. (Running on oeis4.)