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R. H. Hardin, <a href="/A260603/b260603.txt">Table of n, a(n) for n = 1..210</a>
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Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101
58, 118, 250, 532, 1136, 2480, 5418, 11776, 25694, 56138, 122376, 266782, 582226, 1270070, 2769414, 6041044, 13178442, 28742456, 62690698, 136748242, 298274638, 650578696, 1419055920, 3095272272, 6751343236, 14725993444, 32120472836
1,1
Column 2 of A260609
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
Some solutions for n=4
..1..0..0..0....0..0..0..0....0..0..0..1....1..0..1..0....0..0..0..1
..0..1..0..0....1..0..0..0....1..0..1..0....0..1..0..0....1..0..0..0
..1..0..1..0....0..1..0..1....0..1..0..0....0..0..1..0....0..1..0..0
..0..0..0..1....1..0..0..0....0..0..1..0....0..1..0..0....0..0..1..0
..0..0..1..0....0..0..0..1....0..0..0..1....0..0..1..0....0..1..0..0
..0..1..0..0....0..0..1..0....0..0..1..0....0..1..0..0....0..0..1..0
Cf. A260609
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R. H. Hardin, Jul 29 2015
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