A260012 - OEIS

%I #4 Jul 13 2015 08:46:16

%S 436,1232,6944,25600,87024,294336,1231648,4380288,16773440,58243968,

%T 231701952,814232832,3185356416,11129195264,43863022976,153683692032,

%U 603684726016,2112267329024,8309822447360,29094787617792,114381212785152

%N Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010101 or 01010101

%C Column 5 of A260015

%H R. H. Hardin, <a href="/A260012/b260012.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 8*a(n-2) +108*a(n-4) -288*a(n-6) -1828*a(n-8) +4768*a(n-10) +4128*a(n-12) -11008*a(n-14) -4608*a(n-16) +4096*a(n-18) for n>21

%e Some solutions for n=4

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

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

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

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

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

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

%Y Cf. A260015

%K nonn

%O 1,1

%A _R. H. Hardin_, Jul 13 2015