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!)
A252302 Number of (n+2)X(5+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

%I

%S 4349,3171,3902,5230,9368,14515,20910,42082,66739,98782,217314,348739,

%T 531390,1284226,2070979,3235390,8478402,13717315,21847614,60676930,

%U 98374723,158681662,456864834,741606979,1205129790,3540805186,5751409219

%N Number of (n+2)X(5+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

%C Column 5 of A252305

%H R. H. Hardin, <a href="/A252302/b252302.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 15*a(n-3) -70*a(n-6) +120*a(n-9) -64*a(n-12) for n>21

%e Some solutions for n=4

%e ..2..0..1..2..3..1..2....3..2..1..3..2..1..3....0..1..2..0..1..2..3

%e ..0..0..0..0..0..0..3....0..0..0..0..0..3..0....0..0..3..0..0..0..0

%e ..3..2..1..3..2..1..0....1..2..3..1..2..0..1....2..1..3..2..1..3..2

%e ..2..3..1..2..0..1..2....3..2..1..3..2..1..3....0..1..2..3..1..2..0

%e ..0..0..0..3..3..0..3....0..0..0..0..0..3..0....0..0..0..0..0..3..3

%e ..3..2..1..0..2..1..0....1..2..3..1..2..0..1....2..1..3..2..1..3..2

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 16 2014

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 August 14 09:27 EDT 2022. Contains 356110 sequences. (Running on oeis4.)