login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A236821 Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the minimum minus the lower median of every 2X2 subblock equal 1
81, 327, 1386, 6093, 27079, 121590, 549173, 2495215, 11389842, 52223381, 240352711, 1110041358, 5141952693, 23882414527, 111181569882, 518644232789, 2423637273943, 11342969544566, 53156257829813, 249385929539023 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A236828

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) -2*a(n-2) -167*a(n-3) +265*a(n-4) +1110*a(n-5) -2280*a(n-6) -3350*a(n-7) +7924*a(n-8) +4700*a(n-9) -13072*a(n-10) -2560*a(n-11) +9856*a(n-12) +128*a(n-13) -2560*a(n-14)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A017162 A250427 A236828 * A237511 A237504 A222162

Adjacent sequences: A236818 A236819 A236820 * A236822 A236823 A236824

KEYWORD

nonn

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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 28 15:37 EST 2023. Contains 359895 sequences. (Running on oeis4.)