A255227 - OEIS

%I #4 Feb 17 2015 13:25:43

%S 127,133,142,154,172,199,238,295,379,502,682,946,1333,1900,2731,3949,

%T 5734,8350,12184,17803,26038,38107,55795,81718,119710,175390,256993,

%U 376588,551863,808741,1185214,1736962,2545588,3730687,5467534,8013007

%N Number of (n+2)X(7+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 and no antidiagonal sum 0 and no row sum 2 and no column sum 2

%C Column 7 of A255228

%H R. H. Hardin, <a href="/A255227/b255227.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 2*a(n-1) -a(n-2) +a(n-3) -a(n-4)

%e Some solutions for n=4

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

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

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

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

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

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

%Y Cf. A255228

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 17 2015