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A255024 Number of (n+2)X(5+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 or 1 and no antidiagonal sum 0 or 1 and no row sum 0 or 1 and no column sum 0 or 1 1

%I #4 Feb 13 2015 07:44:28

%S 601,3015,17447,92217,480456,2547757,13460633,71027915,375675337,

%T 1985308048,10482759493,55378851627,292644335768,1546162330270,

%U 8168095347942,43152835319622,227991513370735,1204546728063170

%N Number of (n+2)X(5+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 or 1 and no antidiagonal sum 0 or 1 and no row sum 0 or 1 and no column sum 0 or 1

%C Column 5 of A255027

%H R. H. Hardin, <a href="/A255024/b255024.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = a(n-1) +3*a(n-2) +42*a(n-3) +223*a(n-4) +485*a(n-5) +723*a(n-6) -806*a(n-7) -5802*a(n-8) -7742*a(n-9) -2191*a(n-10) +15114*a(n-11) +38950*a(n-12) +12875*a(n-13) -51485*a(n-14) -62587*a(n-15) -10948*a(n-16) +70876*a(n-17) +106851*a(n-18) +53452*a(n-19) -26830*a(n-20) -86750*a(n-21) -110193*a(n-22) -37947*a(n-23) +2815*a(n-24) +1242*a(n-25) +25129*a(n-26) -34729*a(n-27) -623*a(n-28) -6984*a(n-29) -7065*a(n-30) +17065*a(n-31) -14376*a(n-32) +11137*a(n-33) -9534*a(n-34) +5434*a(n-35) -2728*a(n-36) +1898*a(n-37) -781*a(n-38) +255*a(n-39) -156*a(n-40) +24*a(n-41) +11*a(n-42) -5*a(n-43) for n>45

%e Some solutions for n=4

%e ..1..1..1..1..1..1..0....1..1..1..1..1..0..1....0..1..1..1..0..1..1

%e ..0..1..1..1..0..1..1....1..1..0..1..1..1..1....1..1..1..1..1..1..0

%e ..1..1..1..1..1..1..1....1..1..1..1..1..1..0....1..1..1..0..1..1..1

%e ..1..0..1..1..1..1..1....1..1..1..1..1..1..1....1..1..1..1..1..1..1

%e ..1..1..1..1..1..1..0....1..1..1..1..1..0..1....1..1..0..1..1..1..1

%e ..1..1..1..1..1..1..1....0..1..1..0..1..1..1....0..1..1..1..1..1..0

%Y Cf. A255027

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 13 2015

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Last modified April 19 12:14 EDT 2024. Contains 371792 sequences. (Running on oeis4.)