The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A250820 Number of (n+2) X (1+2) 0..1 arrays with nondecreasing maximum minus minimum of every three consecutive values in every row and column. 1
512, 2744, 13824, 64000, 287496, 1259712, 5451776, 23393656, 99897344, 425259008, 1806932232, 7668682048, 32522853888, 137867914296, 584277056000, 2475715773952, 10489077269000, 44437096088000, 188250740195328 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A250826.
LINKS
FORMULA
Empirical: a(n) = 7*a(n-1) -8*a(n-2) -27*a(n-3) +45*a(n-4) +24*a(n-5) -51*a(n-6) -3*a(n-7) +16*a(n-8) -a(n-9) -a(n-10).
EXAMPLE
Some solutions for n=4
..1..1..0....0..1..1....0..1..1....0..0..1....0..0..0....1..1..0....0..1..1
..0..1..1....0..0..1....0..0..0....0..1..0....0..1..0....0..1..0....0..1..1
..1..0..1....1..1..1....1..1..0....1..0..0....0..0..0....1..0..0....0..0..0
..0..0..0....0..0..1....1..0..1....0..1..1....0..1..0....0..0..1....0..0..0
..1..1..1....0..1..1....0..1..0....1..1..0....1..0..0....1..1..1....1..1..1
..1..1..0....1..1..0....0..0..0....1..0..1....0..0..1....1..0..0....0..0..0
CROSSREFS
Cf. A250826.
Sequence in context: A253986 A250826 A250504 * A250497 A254260 A254306
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 27 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 May 27 13:56 EDT 2024. Contains 372861 sequences. (Running on oeis4.)