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!)
A234556 Number of (n+1) X (n+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant-stress 1 X 1 tilings). 0
70, 546, 2390, 11982, 42982, 187686, 635654, 2614518, 8740870, 34959606, 117588230, 464375382, 1585487302 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=5:

  0 4 1 4 2 4    2 1 3 1 2 2    1 0 2 0 2 0    0 4 0 4 0 2

  1 1 2 1 3 1    0 3 1 3 0 4    0 3 1 3 1 3    3 3 3 3 3 1

  0 4 1 4 2 4    3 2 4 2 3 3    1 0 2 0 2 0    0 4 0 4 0 2

  0 0 1 0 2 0    0 3 1 3 0 4    1 4 2 4 2 4    4 4 4 4 4 2

  0 4 1 4 2 4    1 0 2 0 1 1    3 2 4 2 4 2    0 4 0 4 0 2

  2 2 3 2 4 2    0 3 1 3 0 4    0 3 1 3 1 3    3 3 3 3 3 1

CROSSREFS

Diagonal of A234564.

Sequence in context: A060541 A235302 A229576 * A183715 A104475 A169712

Adjacent sequences:  A234553 A234554 A234555 * A234557 A234558 A234559

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 28 2013

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 October 6 00:49 EDT 2022. Contains 357261 sequences. (Running on oeis4.)