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!)
A252193 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 7 0
441, 470, 1647, 21928, 480526, 16789626, 896763106, 73759241737, 9393184984437, 1838801806417542, 553960321837762379, 257519518174289401266, 184540608154581393175482, 203698879433082432079178181 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A252201

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=4

..3..3..3..3..3..2....2..3..3..3..3..2....2..3..3..3..3..2....3..3..2..3..3..3

..3..3..3..2..3..3....3..3..3..3..3..3....3..3..3..3..3..3....2..3..3..3..2..3

..2..3..3..3..3..3....3..3..3..3..3..3....3..3..3..3..3..3....3..3..3..3..3..3

..3..3..3..3..3..3....2..3..3..3..3..3....3..3..3..3..2..3....3..3..3..3..3..3

..3..3..3..3..3..3....3..3..2..3..3..3....3..3..2..3..3..3....3..3..2..3..3..3

..3..3..2..3..3..2....3..3..3..3..3..3....3..3..3..3..3..2....2..3..3..3..3..3

CROSSREFS

Sequence in context: A187239 A272716 A124170 * A207650 A207045 A252201

Adjacent sequences:  A252190 A252191 A252192 * A252194 A252195 A252196

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 15 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 September 25 20:01 EDT 2021. Contains 347659 sequences. (Running on oeis4.)