login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A253812 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal sum minus antidiagonal median nondecreasing horizontally and vertically 0
512, 12992, 214596, 1713952, 20991976, 250052478, 1124641848, 5696013500, 59724420234, 668675350006, 2474515112828 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A253820

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=2

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

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

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

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

CROSSREFS

Sequence in context: A254475 A254768 A254504 * A256947 A254720 A254252

Adjacent sequences:  A253809 A253810 A253811 * A253813 A253814 A253815

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 14 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 25 13:59 EDT 2021. Contains 346290 sequences. (Running on oeis4.)