login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A253365 Number of (n+2)X(6+2) 0..1 arrays with every 2X2 and 3X3 subblock diagonal maximum minus antidiagonal minimum unequal to its neighbors horizontally and vertically 1
3472, 5664, 27072, 53128, 175328, 520888, 1255456, 4289736, 9455136, 31254904, 73764448, 218493128, 577738400, 1574888312, 4449330272, 12022817096, 33692526368, 94722902008, 253587884000, 742190201160, 1916549546400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A253367

LINKS

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

FORMULA

Empirical: a(n) = 16*a(n-2) -110*a(n-4) +432*a(n-6) -809*a(n-8) +2032*a(n-10) -4696*a(n-12) +4432*a(n-14) -2272*a(n-16) -1952*a(n-18) -224*a(n-20) +320*a(n-22) for n>26

EXAMPLE

Some solutions for n=4

..0..1..0..1..0..1..0..1....0..1..0..1..0..1..0..1....1..1..1..1..1..0..1..1

..0..0..0..0..0..0..0..0....1..1..1..1..1..1..1..1....0..1..0..1..1..1..0..1

..0..1..0..1..0..1..0..1....0..1..0..1..0..1..0..1....1..0..1..0..1..0..1..1

..1..0..0..0..0..0..0..0....1..1..1..1..1..1..1..1....0..1..1..1..1..1..0..1

..1..1..0..1..0..1..0..1....0..1..0..1..0..1..0..1....1..0..1..0..1..1..1..1

..1..1..1..0..0..0..0..0....1..1..1..0..1..0..0..0....0..1..1..1..0..1..0..1

CROSSREFS

Sequence in context: A108250 A237548 A237546 * A109484 A232889 A159215

Adjacent sequences:  A253362 A253363 A253364 * A253366 A253367 A253368

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 30 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 August 18 08:57 EDT 2019. Contains 326077 sequences. (Running on oeis4.)