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!)
A252304 Number of (n+2)X(7+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
12027, 7625, 8650, 11639, 22521, 34279, 48579, 109845, 172039, 240515, 630341, 1001223, 1372035, 4084741, 6541831, 8798211, 28880133, 46506247, 61723395, 215907589, 348800263, 459211011, 1666815237, 2697504007, 3535502595 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 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>24

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A235308 A064966 A292815 * A251680 A247688 A236726

Adjacent sequences:  A252301 A252302 A252303 * A252305 A252306 A252307

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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 27 04:01 EDT 2022. Contains 354888 sequences. (Running on oeis4.)