login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A252312 Number of (7+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 1 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 1 3 6 or 7 1
5496, 4905, 7492, 10626, 20910, 33862, 48579, 104334, 172130, 244167, 588270, 986138, 1389063, 3730350, 6337034, 8869479, 25958190, 44510186, 62011047, 192163374, 331380650, 460363047, 1475370030, 2552327978, 3540109863 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A252305

LINKS

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

FORMULA

Empirical: a(n) = 15*a(n-3) -70*a(n-6) +120*a(n-9) -64*a(n-12) for n>19

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A251885 A251878 A251877 * A247924 A031617 A045132

Adjacent sequences:  A252309 A252310 A252311 * A252313 A252314 A252315

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 October 18 10:05 EDT 2019. Contains 328146 sequences. (Running on oeis4.)