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!)
A253538 Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal minimum nonincreasing horizontally and nondecreasing vertically 1
3328, 33568, 317696, 2801200, 24576256, 212432512, 1834356992, 15757354000, 135327129856, 1160905055456, 9961373970688, 85451698082544, 733064872902912, 6288070321166400, 53938785323602176, 462674442188361424 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A253544

LINKS

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

FORMULA

Empirical: a(n) = 13*a(n-1) -37*a(n-2) -95*a(n-3) +1181*a(n-4) -3897*a(n-5) +1721*a(n-6) -11813*a(n-7) +86096*a(n-8) -17360*a(n-9) -280192*a(n-10) +266368*a(n-11) -103680*a(n-12) +1683712*a(n-13) -11894784*a(n-14) +12763136*a(n-15) +24772608*a(n-16) -31457280*a(n-17) -12582912*a(n-18) +16777216*a(n-19)

EXAMPLE

Some solutions for n=2

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

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

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

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

CROSSREFS

Sequence in context: A252510 A253872 A253865 * A147881 A230307 A043504

Adjacent sequences:  A253535 A253536 A253537 * A253539 A253540 A253541

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 03 2015

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 23 21:44 EDT 2022. Contains 353993 sequences. (Running on oeis4.)