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!)
A237931 Number of (n+1)X(1+1) 0..3 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
256, 1718, 11701, 81402, 563166, 3880918, 26804881, 185489824, 1282099556, 8852862392, 61169759404, 422870170848, 2922385929712, 20190059774152, 139517455447976, 964213093638072, 6663225933024004, 46041769193957056 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A237936
LINKS
FORMULA
Empirical: a(n) = 1888*a(n-4) +26908*a(n-6) -301104*a(n-8) -4523964*a(n-10) +9356144*a(n-12) +158092496*a(n-14) +15024960*a(n-16) -2150807552*a(n-18) -1973442560*a(n-20) +11283515392*a(n-22) +13873016832*a(n-24) -19456245760*a(n-26) -21131821056*a(n-28) +10415243264*a(n-30) +385875968*a(n-32) -96468992*a(n-34) -16777216*a(n-36)
EXAMPLE
Some solutions for n=4
..1..0....2..2....0..3....2..2....2..1....2..1....1..0....0..2....1..1....0..2
..1..3....3..3....1..2....2..1....0..1....1..0....0..2....3..2....0..1....0..2
..2..2....2..1....3..1....2..1....2..2....0..1....1..1....0..3....2..2....3..1
..3..0....2..2....3..1....3..0....2..3....1..2....1..3....1..3....0..2....2..3
..3..2....2..0....1..2....3..1....3..2....3..2....1..2....1..3....3..1....0..1
CROSSREFS
Sequence in context: A237175 A237169 A237936 * A237494 A237489 A238054
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 16 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 March 28 11:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)