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%I #6 May 17 2023 12:28:25
%S 265,760,3480,10570,35036,110886,416107,1244504,4489732,13887332,
%T 50550272,153892178,560073447,1715846404,6236321603,19065593974,
%U 69365627376,212174735776,771528061749,2359839029908,8583078813482
%N Number of (n+2) X (7+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 or 01010101.
%C Column 7 of A259742.
%H R. H. Hardin, <a href="/A259741/b259741.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 4*a(n-2) +72*a(n-4) +126*a(n-6) -506*a(n-8) -177*a(n-10) +2157*a(n-12) -663*a(n-14) -6554*a(n-16) +8949*a(n-18) -1807*a(n-20) -4122*a(n-22) +1182*a(n-24) +500*a(n-26) +261*a(n-28) +111*a(n-30) -10*a(n-32) +10*a(n-34) for n>37.
%e Some solutions for n=4
%e ..1..0..1..0..1..0..1..0..1....1..0..1..0..1..0..1..0..1
%e ..0..0..0..1..0..1..0..1..0....0..0..0..1..0..1..0..1..0
%e ..1..0..1..0..1..0..1..0..1....1..0..1..0..1..0..1..0..1
%e ..0..1..0..1..0..1..0..0..0....0..1..0..1..0..1..0..0..0
%e ..1..0..0..0..1..0..1..0..1....0..0..1..0..0..0..1..0..1
%e ..0..1..0..1..0..1..0..1..0....0..1..0..1..0..1..0..1..0
%Y Cf. A259742.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jul 04 2015