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!)
A252645 Number of (5+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7 1

%I #4 Dec 19 2014 11:38:07

%S 4382,28978,145594,395940,2641643,14252070,39238223,282076967,

%T 1562428650,4317049341,33191406729,186102810754,519319781185,

%U 4188303585399,23594059633148,66676725102239,554460061190973,3126643877968488

%N Number of (5+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7

%C Row 5 of A252640

%H R. H. Hardin, <a href="/A252645/b252645.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 424*a(n-3) -72312*a(n-6) +6593809*a(n-9) -362649424*a(n-12) +12966833847*a(n-15) -318077673736*a(n-18) +5579536172662*a(n-21) -72397889059571*a(n-24) +714990152543472*a(n-27) -5502974489523412*a(n-30) +33615022144780460*a(n-33) -164978487557249434*a(n-36) +654835044110359358*a(n-39) -2106135297077276208*a(n-42) +5481489521504612286*a(n-45) -11505481554272991256*a(n-48) +19391619848013982308*a(n-51) -26122513500027821176*a(n-54) +28001956970298777680*a(n-57) -23793990756728478384*a(n-60) +15973131174315720512*a(n-63) -8433805375387204384*a(n-66) +3471175879527764608*a(n-69) -1095501701926080192*a(n-72) +258934215350992640*a(n-75) -44555469163692032*a(n-78) +5375791566110720*a(n-81) -420928052133888*a(n-84) +17659974385664*a(n-87) -276446576640*a(n-90) for n>94

%e Some solutions for n=3

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

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 19 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 April 24 03:08 EDT 2024. Contains 371918 sequences. (Running on oeis4.)