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A252568 Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7 1

%I

%S 843,868,1558,3286,7610,17261,39419,94224,218717,504824,1216914,

%T 2842764,6585725,15930113,37308440,86581201,209741403,491769283,

%U 1142254876,2768731230,6494985545,15093638282,36592496037,85859457999,199589766685

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

%C Column 2 of A252574

%H R. H. Hardin, <a href="/A252568/b252568.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 41*a(n-3) -642*a(n-6) +4961*a(n-9) -21249*a(n-12) +55203*a(n-15) -94450*a(n-18) +115159*a(n-21) -104947*a(n-24) +71287*a(n-27) -34926*a(n-30) +11911*a(n-33) -2699*a(n-36) +381*a(n-39) -30*a(n-42) +a(n-45) for n>50

%e Some solutions for n=4

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 18 2014

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Last modified May 25 10:05 EDT 2022. Contains 354066 sequences. (Running on oeis4.)