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!)
A236273 Number of (n+1)X(3+1) 0..2 arrays with the upper median unequal to the lower median in every 2X2 subblock 1
1048, 15434, 232736, 3604782, 56299040, 884625654, 13930389246, 219666732130, 3465756760168, 54697571104400, 863364488755858, 13628610245730708, 215140611062094002, 3396256121150879282, 53614426723942801722 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A236278

LINKS

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

FORMULA

Empirical: a(n) = 23*a(n-1) -16*a(n-2) -2232*a(n-3) +7199*a(n-4) +81562*a(n-5) -305840*a(n-6) -1579897*a(n-7) +5702786*a(n-8) +18527773*a(n-9) -56010227*a(n-10) -138644483*a(n-11) +297115491*a(n-12) +656260628*a(n-13) -774956030*a(n-14) -1816063888*a(n-15) +616468708*a(n-16) +2397532500*a(n-17) +617130944*a(n-18) -763319696*a(n-19) -368062992*a(n-20) +11133168*a(n-21) +22287808*a(n-22) +1286144*a(n-23) -327168*a(n-24) -26624*a(n-25)

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A056092 A280809 A252307 * A251375 A281033 A337960

Adjacent sequences:  A236270 A236271 A236272 * A236274 A236275 A236276

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 21 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 June 29 18:25 EDT 2022. Contains 354913 sequences. (Running on oeis4.)