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!)
A252256 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 3 6 or 7 0
1072, 1016, 596, 1316, 3530, 9836, 33218, 252162, 1017410, 4251650, 95453186, 461119490, 2176843778, 165104582658, 884163477506, 4458176053250 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A252260

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Some solutions for n=4

..0..3..1..0..0..1....1..1..3..1..1..3....2..3..0..1..0..3....2..3..0..1..0..3

..1..1..3..1..1..2....0..0..1..0..0..1....1..0..0..1..0..0....1..0..0..1..0..0

..0..0..1..0..0..1....0..0..1..0..0..1....2..1..1..3..1..1....2..1..1..3..1..1

..0..0..1..0..0..1....1..1..3..1..1..2....1..0..0..1..0..0....1..0..0..1..0..0

..1..1..3..1..1..2....0..0..1..0..0..1....1..0..0..1..0..3....1..0..0..1..0..3

..0..0..1..0..0..1....0..0..1..0..3..1....3..1..1..2..1..1....2..1..1..3..1..1

CROSSREFS

Sequence in context: A020386 A236870 A345904 * A345525 A345779 A252257

Adjacent sequences:  A252253 A252254 A252255 * A252257 A252258 A252259

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 16 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 November 29 20:40 EST 2021. Contains 349416 sequences. (Running on oeis4.)