# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a260603 Showing 1-1 of 1 %I A260603 #4 Jul 29 2015 22:38:14 %S A260603 58,118,250,532,1136,2480,5418,11776,25694,56138,122376,266782,582226, %T A260603 1270070,2769414,6041044,13178442,28742456,62690698,136748242, %U A260603 298274638,650578696,1419055920,3095272272,6751343236,14725993444,32120472836 %N A260603 Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101 %C A260603 Column 2 of A260609 %H A260603 R. H. Hardin, Table of n, a(n) for n = 1..210 %F A260603 Empirical: a(n) = a(n-1) +4*a(n-3) +3*a(n-4) +2*a(n-6) +2*a(n-7) -4*a(n-8) +3*a(n-9) +4*a(n-10) -a(n-11) +a(n-12) +a(n-13) for n>14 %e A260603 Some solutions for n=4 %e A260603 ..1..0..0..0....0..0..0..0....0..0..0..1....1..0..1..0....0..0..0..1 %e A260603 ..0..1..0..0....1..0..0..0....1..0..1..0....0..1..0..0....1..0..0..0 %e A260603 ..1..0..1..0....0..1..0..1....0..1..0..0....0..0..1..0....0..1..0..0 %e A260603 ..0..0..0..1....1..0..0..0....0..0..1..0....0..1..0..0....0..0..1..0 %e A260603 ..0..0..1..0....0..0..0..1....0..0..0..1....0..0..1..0....0..1..0..0 %e A260603 ..0..1..0..0....0..0..1..0....0..0..1..0....0..1..0..0....0..0..1..0 %Y A260603 Cf. A260609 %K A260603 nonn %O A260603 1,1 %A A260603 _R. H. Hardin_, Jul 29 2015 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE